Oldbie bike racer
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3 years ago I was pushing nearly 300 pounds. What I didn't know was that I was a ticking time bomb because throughout my life I was completely unaware of just how low my HDL was. For those who don't understand how this works, your HDL (also known as the "good cholesterol") effectively clears the presence of LDL in your blood that is responsible for the plaque that collects on the artery walls. Minimum HDL is considered about 40 MG/DL. Most people are around 50 or more. Mine was measured at 18.
I didn't know this until I began to experience chest pain while riding a bike on Super Bowl Sunday, 2003. A trip to the hospital revealed a 99% blocked coronary artery. I was on borrowed time. Fortunately I already had a mindset to improve my health. Since that time I significantly reduced the amount of saturated fat in my diet, and focused primarily on complex carbohydrates, plant protein and monounsaturated fats with some polyunsaturated fats. I've been eating meat sparingly dining primarily on fish and some chicken (no skin!). I'm down to 190 pounds and I've been there for about a year now (still want to drop another 10 -15). 3 years ago my LDL was 155, HDL was 18, and triglycerides over 200. January of last year my LDL was 100, HDL was 27, and triglycerides was 131. My diet has remained the same for the past three years. The only change I made was to markedly increase my exercise regimen last January. Now my LDL is 76 and my HDL is 36 (without any cholesterol lowering drugs). In addition to that, my at rest heart rate is now 45 bpm. Exercise plays a significant role on your cholesterol.
Finally, every year I undergo a treadmill stress test to my MHR (170 bpm last August) and to image my coronary arteries. The last imaging showed an increase volume of blood and a reduction in my blood pressure. It's expected that I'll be off blood pressure medication by next August. Currently I ride between 100 and 150 miles/week, and workout 60 minutes 6 days a week in the gym (mostly elliptical trainer). My goal this year is to complete the Tour of the California Alps in July (129 miles and 15000+ climbing in one day). I never thought I'd say this but I really like climbing!
Oh, yeah, I'm 50 years young.
It must feel great to have not only saved your own life, but then to turn it around so well. Super Bowl Sunday will always have a special meaning for you. Kind of ironic that 3 years ago you were literally on a death ride, and now your goal is to do a ride that is so hard it's known as "The Death Ride".Originally Posted by SimiCyclist
I think I'll throw in my own anecdote here, since a relationship with HDL, triglycerides and heart disease was mentioned.3 years ago I was pushing nearly 300 pounds. What I didn't know was that I was a ticking time bomb because throughout my life I was completely unaware of just how low my HDL was. For those who don't understand how this works, your HDL (also known as the "good cholesterol") effectively clears the presence of LDL in your blood that is responsible for the plaque that collects on the artery walls. Minimum HDL is considered about 40 MG/DL. Most people are around 50 or more. Mine was measured at 18.
I didn't know this until I began to experience chest pain while riding a bike on Super Bowl Sunday, 2003. A trip to the hospital revealed a 99% blocked coronary artery. I was on borrowed time. Fortunately I already had a mindset to improve my health. Since that time I significantly reduced the amount of saturated fat in my diet, and focused primarily on complex carbohydrates, plant protein and monounsaturated fats with some polyunsaturated fats. I've been eating meat sparingly dining primarily on fish and some chicken (no skin!). I'm down to 190 pounds and I've been there for about a year now (still want to drop another 10 -15). 3 years ago my LDL was 155, HDL was 18, and triglycerides over 200. January of last year my LDL was 100, HDL was 27, and triglycerides was 131. My diet has remained the same for the past three years. The only change I made was to markedly increase my exercise regimen last January. Now my LDL is 76 and my HDL is 36 (without any cholesterol lowering drugs). In addition to that, my at rest heart rate is now 45 bpm. Exercise plays a significant role on your cholesterol.
Finally, every year I undergo a treadmill stress test to my MHR (170 bpm last August) and to image my coronary arteries. The last imaging showed an increase volume of blood and a reduction in my blood pressure. It's expected that I'll be off blood pressure medication by next August. Currently I ride between 100 and 150 miles/week, and workout 60 minutes 6 days a week in the gym (mostly elliptical trainer). My goal this year is to complete the Tour of the California Alps in July (129 miles and 15000+ climbing in one day). I never thought I'd say this but I really like climbing!
Oh, yeah, I'm 50 years young.
Senior Member
Warren G, you cranky dogmatic blowhard (hey, this childish insult thing is kinda fun, who knew?)
if they are so widely available, let's see them. back up your stand. remember, they must involve athletes that have had time to acclimate. you demanded studies from me, but seem rather reluctant to produce your own.
meanwhile, this article references some studies you might find of interest: https://www.lowcarbportal.com/archive...cise/index.php
I think we already agreed on the role carbs can play for a competive athlete. OP's situation doesn't have much in common with the Lance Armstrongs of the world.
Quote:
Originally Posted by WarrenG
What I've said is widely available by reading ANY good exercise pyhsiology text, looking at countless scientific studies, etc. What I've said sounds foreign to you, but it's actually pretty basic physiology that you could easily read about yourself.if they are so widely available, let's see them. back up your stand. remember, they must involve athletes that have had time to acclimate. you demanded studies from me, but seem rather reluctant to produce your own.
meanwhile, this article references some studies you might find of interest: https://www.lowcarbportal.com/archive...cise/index.php
Quote:
You have only shown us studies where the subjects were exercising at intensities of 60-64% of VO2max, and below that. These are very low intensities-as I said earlier, these are the intensity a recreational cyclist would use for their recovery or off days on the bike and a decent bike racer would use something near 70% of MHR for their recovery days. This intensity is BELOW the threshold of what would improve aerobic or anaerobic fitness in a person with at least a minimum of training. You can look it up.
Also, some of the studies said they had to feed the subjects large amounts of carbs right before the testing and during the te
sting, or they did carbo loading for three days prior to the testing. What does this tell you about the need for carbs? You said you would use carbs on the day of a race if you ever did a triathlon. Well, if you think the carbs would help you during that event it shouldn't be too hard to understand they'd also help you perform better in training too. If you train better you'll race better too.
I'll refer you back to the studies posted regarding increased mitochondriia and triglycerides in the muscle after just a few weeks training on a high fat diet...You have only shown us studies where the subjects were exercising at intensities of 60-64% of VO2max, and below that. These are very low intensities-as I said earlier, these are the intensity a recreational cyclist would use for their recovery or off days on the bike and a decent bike racer would use something near 70% of MHR for their recovery days. This intensity is BELOW the threshold of what would improve aerobic or anaerobic fitness in a person with at least a minimum of training. You can look it up.
Also, some of the studies said they had to feed the subjects large amounts of carbs right before the testing and during the te
sting, or they did carbo loading for three days prior to the testing. What does this tell you about the need for carbs? You said you would use carbs on the day of a race if you ever did a triathlon. Well, if you think the carbs would help you during that event it shouldn't be too hard to understand they'd also help you perform better in training too. If you train better you'll race better too.
I think we already agreed on the role carbs can play for a competive athlete. OP's situation doesn't have much in common with the Lance Armstrongs of the world.
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So you rely on the age estimate for MHR? I suggest you do some reading about the way that number was calculated. Generally speaking you are almost as likely to be off by 10bpm plus or minus as you would be to find your actual MHR at the age estimate. Furthermore, MHR is a very poor estimator for intensity (that's why real studies don't use it to estimate intensity) because there is a fairly wide range of HR% associated with a person's actual VO2max intensity, or LT intensity, or OBLA intensity, etc. So if you use %of your estimated MHR for your intensities you are using a broad estimate, and then compounding the problem by using another estimate on top of the first estimate.
um, once again, what does my situation have to do with anything? that said, I'll be sure to give you an update in six months... btw, dont want to defend the age based guestimater for MHR, but it's interesting how it did accurately predict the MHR for the poster above. in my case, I suspect it's at least 10 beats low, but I wont know till I get into good enough shape to figure it out myself.So you rely on the age estimate for MHR? I suggest you do some reading about the way that number was calculated. Generally speaking you are almost as likely to be off by 10bpm plus or minus as you would be to find your actual MHR at the age estimate. Furthermore, MHR is a very poor estimator for intensity (that's why real studies don't use it to estimate intensity) because there is a fairly wide range of HR% associated with a person's actual VO2max intensity, or LT intensity, or OBLA intensity, etc. So if you use %of your estimated MHR for your intensities you are using a broad estimate, and then compounding the problem by using another estimate on top of the first estimate.
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11+ hours a week of exercise and all of it at MAYBE 70% or lower of your estimated MHR... you need to learn a LOT more about training and nutrition before you try to tell other people what they should be doing.
imo, so do you. You've offered no valid reason why OP should change his diet. also, I really dont care about your opinion of my training methods, so shut the f*** up already.11+ hours a week of exercise and all of it at MAYBE 70% or lower of your estimated MHR... you need to learn a LOT more about training and nutrition before you try to tell other people what they should be doing.
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mr freddy: beginner expert, an oxymoron.
once again, go f*** yourself. yawn.mr freddy: beginner expert, an oxymoron.
[great custom user title]
NO! What has made our society so overweight is a major change for the worse in diet. It has nothing to do with old thinking. In fact if we all still thought that way we wouldnt have car companies putting bigger seats in their cars for the growing american bottom.
In 1950 the most popular beverage for the US teenager was milk. Beleive it or not. At the emerging fastfood restaurants the "large" soda was 8 us ounces. Now the "Kiddie" soda is 10 us ounces!
A Coke and Fries are among the worst things you can eat, yet many of us do it daily, and in far greater quantities than we should. THAT IS WHY WE ARE FAT!
In 1950 the most popular beverage for the US teenager was milk. Beleive it or not. At the emerging fastfood restaurants the "large" soda was 8 us ounces. Now the "Kiddie" soda is 10 us ounces!
A Coke and Fries are among the worst things you can eat, yet many of us do it daily, and in far greater quantities than we should. THAT IS WHY WE ARE FAT!Senior Member
AnthonyG
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OK I've just got back from a 80 km (50 mile) ride in 3 hours and 18 minutes so it wasn't super fast but not that bad for my beater bike. Breakfast was my usual dandelion tea followed by sour milk and cream and a little chicken liver pate. Heaps of fat! I took some dates and cashews with me just in case but I intended to go for as long as I could without eating to see how far I got.
2 hours into the ride I started feeling a little tired and unhappy. Heck, 2 hours isn't bad for a fat fuelled ride and I was going at a reasonable pace. Not super fast but as usual faster than I intended to go. So I started with a couple of dates to see what happened. 10 minutes later I started to feel a little more energy so I gradually ate on the way home and by the time I got home I wasn't feeling that bad and I was pulling along nicely.
So a little carbs helped but I wasn't carbo-loading. Starting the day in my usual high fat way worked for me and ONLY consuming the carbs while I was working was a good stratergy for me too. Natural foods only for me as well. No proccessed sugars. If I'm racing it would be a good idea to start eating carbs a little earlier.
So anyway. How many of you carbo-loaders could have got past 2 hours anyway before needing to eat and how well would you have recovered if you let it get to that point.
Regards, Anthony
2 hours into the ride I started feeling a little tired and unhappy. Heck, 2 hours isn't bad for a fat fuelled ride and I was going at a reasonable pace. Not super fast but as usual faster than I intended to go. So I started with a couple of dates to see what happened. 10 minutes later I started to feel a little more energy so I gradually ate on the way home and by the time I got home I wasn't feeling that bad and I was pulling along nicely.
So a little carbs helped but I wasn't carbo-loading. Starting the day in my usual high fat way worked for me and ONLY consuming the carbs while I was working was a good stratergy for me too. Natural foods only for me as well. No proccessed sugars. If I'm racing it would be a good idea to start eating carbs a little earlier.
So anyway. How many of you carbo-loaders could have got past 2 hours anyway before needing to eat and how well would you have recovered if you let it get to that point.
Regards, Anthony
Banned.
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Regards, Anthony
I start my rides fasting. I've found that if I eat too much blood is diverted from my system to my gut to deal with the meal. I routinely ride 2-3 hours with just water and come home and eat oatmeal or shredded wheat for breakfast. I'll then wait an hour or two and then eat a regular meal and then wait until supper. I keep my heart rate in the 75% zone for the time that I ride. I've never bonked. I've felt fine after my rides. Sometimes, I'll lie down for a little nap in the afternoon.Originally Posted by AnthonyG
So anyway. How many of you carbo-loaders could have got past 2 hours anyway before needing to eat and how well would you have recovered if you let it get to that point.Regards, Anthony
Banned.
You know, bottom line is this, calories in have to be less than calories out to lose weight. This is the modern dilema. We have never had this much food to eat in our history as a species.
I've been eating vegetarian with a high carbohydrate diet. I've lost weight. My wife is getting frustrated with having me prepare my own food while the family eats her good cooking. This is the reason I was overweight. She says I have a problem with portion control. This is true. If you ate her cooking you'd be looking for ways to take a little off too! She is a very good cook.
So, we've reached a little deal, I am going to eat her cooking and not make her upset and she'll prepare less and help me with portion control. I am going to try this for six months and still ride as hard as I have been and see if I can keep the weight off. If I can then good for me and where I get to sleep! If not, I'll just have to get my jaw wired shut!
I've been eating vegetarian with a high carbohydrate diet. I've lost weight. My wife is getting frustrated with having me prepare my own food while the family eats her good cooking. This is the reason I was overweight. She says I have a problem with portion control. This is true. If you ate her cooking you'd be looking for ways to take a little off too! She is a very good cook.
So, we've reached a little deal, I am going to eat her cooking and not make her upset and she'll prepare less and help me with portion control. I am going to try this for six months and still ride as hard as I have been and see if I can keep the weight off. If I can then good for me and where I get to sleep! If not, I'll just have to get my jaw wired shut!
Oldbie bike racer
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Don't y'all have any real food down there?!Originally Posted by AnthonyG
OK I've just got back from a 80 km (50 mile) ride in 3 hours and 18 minutes so it wasn't super fast but not that bad for my beater bike. Breakfast was my usual dandelion tea followed by sour milk and cream and a little chicken liver pate.
Quote:
So a little carbs helped but I wasn't carbo-loading. Starting the day in my usual high fat way worked for me and ONLY consuming the carbs while I was working was a good stratergy for me too. Natural foods only for me as well. No proccessed sugars. If I'm racing it would be a good idea to start eating carbs a little earlier.
So anyway. How many of you carbo-loaders could have got past 2 hours anyway before needing to eat and how well would you have recovered if you let it get to that point.
Regards, Anthony
2 hours in you noticed a problem. Perhaps you might have ridden even faster or stronger up to that point if you'd given yourself some carbs earlier. General rule of thumb is to drink before you're thirsty and eat before you're hungry, because by then you've already waited too long and you're going to have to wait 10+ minutes to get back up to speed after eating something.Originally Posted by AnthonyG
2 hours into the ride I started feeling a little tired and unhappy. Heck, 2 hours isn't bad for a fat fuelled ride and I was going at a reasonable pace. Not super fast but as usual faster than I intended to go. So I started with a couple of dates to see what happened. 10 minutes later I started to feel a little more energy so I gradually ate on the way home and by the time I got home I wasn't feeling that bad and I was pulling along nicely.So a little carbs helped but I wasn't carbo-loading. Starting the day in my usual high fat way worked for me and ONLY consuming the carbs while I was working was a good stratergy for me too. Natural foods only for me as well. No proccessed sugars. If I'm racing it would be a good idea to start eating carbs a little earlier.
So anyway. How many of you carbo-loaders could have got past 2 hours anyway before needing to eat and how well would you have recovered if you let it get to that point.
Regards, Anthony
Dates are good though. Still used by some pros. When I ride less than 3+ hours I don't need to eat- and those rides will always include some climbs and other hard periods. My two hour rides are on one bottle of Gatorade and include LOTS of intervals, 3-4 days each week. The other days will be a little shorter or longer. For rides of 3-4 hours I drink about 20 ounces of Gatorade each of the first two hours or so. If I find myself feeling like I need to eat then some bread with jam is good, or honey, and I'm not sure why but chocolate brownies work well for me for the rides that go past 3 hours.
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AnthonyG
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I should have said that I didn't have gatorade or anything like that. Just water with a little celtic sea salt so it was no calories at all for 2 hours. It was a bit of an experiment anyway so on future long rides I will start eating earlier as I have no intention of using sugary drinks. There too hard on my digestion apart from anything else.
This ride wasn't a bad effort as I was riding a 24" wheeled mountain bike with slicks and a few nice parts.
Regards, Anthony
This ride wasn't a bad effort as I was riding a 24" wheeled mountain bike with slicks and a few nice parts.
Regards, Anthony
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https://www.findarticles.com/p/articl...19/ai_64714683
Quote:
High-Carbohydrate Vs. High-Fat Diets In Trained Cyclists - Brief Article - Statistical Data Included
R. Brown
Previous studies have examined weight and body composition changes in obese individuals when the proportions of dietary fat and carbohydrate have been altered. Very few studies have examined the effects of macronutrient composition of the diet on body composition in lean subjects engaged in high volumes of physical exercise. A method to determine body fat composition, more accurate then skin-fold measurements and anthropometry, is dual X-ray absorptiometry (DXA). This technique measures both bone mineral and soft tissue composition, and can distinguish fat located in the hips and thighs from that deposited in the trunk. A New Zealand study recently examined the effect of high-fat or high-carbohydrate diets on body composition in athletes using DXA.
DXA was used to examine body composition in cyclists after a 12-week period of either a high-fat or high-carbohydrate dietary regimen to determine whether fat mass and distribution differed between the two diet groups. Thirty male and two female cyclists volunteered to participate; all had participated in competitive cycling for at least two years. Subjects (mean age 26 [+ or -] 9 years), were randomly assigned to receive either high-carbohydrate (HC) or high-fat (HF) dietary advice for a period of 12 weeks. In HF, approximately 45-50% of total energy was derived from fat and 35-40% from carbohydrate. In HC, the proportions were 14% from fat and 65-70% from carbohydrate. Protein intakes were similar for both groups. Each group received a weekly food ration appropriate to their dietary instruction. Each participant received individualized nutritional instruction throughout the study. Five-day food intake was recorded at baseline and every fourth week during the study.
Body weight and total body fat did not change significantly from baseline to week 12 both within and between each diet group. Regional fat distribution changed significantly within each diet group from baseline to week 12. Body fat in the legs decreased significantly in HC and truncal fat increased significantly in HF and HC groups. On examination of individual data, it was clear that the results from two individuals who were siblings skewed the results. This indicates that there may be a genetic predisposition for regional fat distribution with high-fat dietary change. Studies with larger samples are needed to verify this observation.
There were no significant differences in lean tissue mass during the study period. Total bone mineral density (BMD) increased significantly within HF from baseline to week 12. There were significant changes in regional bone density within both groups from baseline to week 12. In HC, BMD increased significantly in the trunk and lumbar regions; in HF, BMD increased in the legs and pelvis. Researchers attributed this to bone mineral accrual of young athletes. Calcium intake tended to be higher in the HF group. Training volume during the study ranged from 115 to 826 km per week (6-25 hours), plus a 40-120 km weekly road race. After 12 weeks of training, maximal oxygen uptake remained at the same high levels as the start of the study.
The results of the study have considerable relevance to the endurance of young athletes. During periods of endurance training, when energy requirements are high, it seems reasonable to suggest that athletes might choose to increase dietary fat intake, even when consuming a significant proportion of fat calories as saturated fats (46%), without the risk of weight gain and/or increased adiposity. It appears that endurance athletes can adapt to high-fat diets without any detrimental effect on physical capacity.
R. Brown, C. Cox, A. Goulding, High-carbohydrate versus high-fat diets: effect on body composition in trained cyclists, Med Sci Sports Exerc 32(3): 690-694 (2000) [Correspondence: Rachel Brown, Dept. of Human Nutrition, University of Otago, PO Box 56, Dunedin, New Zealand. E-mail: rachel.brown@stonebow.otago.ac.nz.]
COPYRIGHT 2000 Technical Insights, a divison of John Wiley & Sons.
COPYRIGHT 2000 Gale Group
High-Carbohydrate Vs. High-Fat Diets In Trained Cyclists - Brief Article - Statistical Data Included
R. Brown
Previous studies have examined weight and body composition changes in obese individuals when the proportions of dietary fat and carbohydrate have been altered. Very few studies have examined the effects of macronutrient composition of the diet on body composition in lean subjects engaged in high volumes of physical exercise. A method to determine body fat composition, more accurate then skin-fold measurements and anthropometry, is dual X-ray absorptiometry (DXA). This technique measures both bone mineral and soft tissue composition, and can distinguish fat located in the hips and thighs from that deposited in the trunk. A New Zealand study recently examined the effect of high-fat or high-carbohydrate diets on body composition in athletes using DXA.
DXA was used to examine body composition in cyclists after a 12-week period of either a high-fat or high-carbohydrate dietary regimen to determine whether fat mass and distribution differed between the two diet groups. Thirty male and two female cyclists volunteered to participate; all had participated in competitive cycling for at least two years. Subjects (mean age 26 [+ or -] 9 years), were randomly assigned to receive either high-carbohydrate (HC) or high-fat (HF) dietary advice for a period of 12 weeks. In HF, approximately 45-50% of total energy was derived from fat and 35-40% from carbohydrate. In HC, the proportions were 14% from fat and 65-70% from carbohydrate. Protein intakes were similar for both groups. Each group received a weekly food ration appropriate to their dietary instruction. Each participant received individualized nutritional instruction throughout the study. Five-day food intake was recorded at baseline and every fourth week during the study.
Body weight and total body fat did not change significantly from baseline to week 12 both within and between each diet group. Regional fat distribution changed significantly within each diet group from baseline to week 12. Body fat in the legs decreased significantly in HC and truncal fat increased significantly in HF and HC groups. On examination of individual data, it was clear that the results from two individuals who were siblings skewed the results. This indicates that there may be a genetic predisposition for regional fat distribution with high-fat dietary change. Studies with larger samples are needed to verify this observation.
There were no significant differences in lean tissue mass during the study period. Total bone mineral density (BMD) increased significantly within HF from baseline to week 12. There were significant changes in regional bone density within both groups from baseline to week 12. In HC, BMD increased significantly in the trunk and lumbar regions; in HF, BMD increased in the legs and pelvis. Researchers attributed this to bone mineral accrual of young athletes. Calcium intake tended to be higher in the HF group. Training volume during the study ranged from 115 to 826 km per week (6-25 hours), plus a 40-120 km weekly road race. After 12 weeks of training, maximal oxygen uptake remained at the same high levels as the start of the study.
The results of the study have considerable relevance to the endurance of young athletes. During periods of endurance training, when energy requirements are high, it seems reasonable to suggest that athletes might choose to increase dietary fat intake, even when consuming a significant proportion of fat calories as saturated fats (46%), without the risk of weight gain and/or increased adiposity. It appears that endurance athletes can adapt to high-fat diets without any detrimental effect on physical capacity.
R. Brown, C. Cox, A. Goulding, High-carbohydrate versus high-fat diets: effect on body composition in trained cyclists, Med Sci Sports Exerc 32(3): 690-694 (2000) [Correspondence: Rachel Brown, Dept. of Human Nutrition, University of Otago, PO Box 56, Dunedin, New Zealand. E-mail: rachel.brown@stonebow.otago.ac.nz.]
COPYRIGHT 2000 Technical Insights, a divison of John Wiley & Sons.
COPYRIGHT 2000 Gale Group
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https://www.buffalo.edu/reporter/vol27/vol27n26/n3.html
Quote:
Study shows a low-fat diet may hinder, not help, athletes
By LOIS BAKER
News Services Staff
RESEARCHERS AT UB have shown that, contrary to prevailing recommendations, trained athletes who consume a very low-fat diet may be hindering their performance rather than enhancing it.
Results of a study of 25 long-distance runners from Western New York who consumed diets consisting of low, medium and high percentages of fat-15, 30 and 45 percent, respectively-showed that endurance time increased and that there was more muscle strength after an exhausting run when the percentage of dietary fat was increased.
In addition, levels of lactic acid, a measure of oxygen delivery, decreased after four weeks on the high-fat diet, indicating an increase in energy reserve.
Study results were presented April 14 at the annual meeting of the Federation of American Societies for Experimental Biology.
The athletes couldn't consume enough calories to meet the energy needs of their training on the low-fat diet. In addition, HDL cholesterol levels were lower on the 15-percent-fat regimen, indicating implications for cardiovascular risk factors.
This study is a follow-up to research reported in 1994 that showed similar results.
"Our conclusion is, for trained distance runners, a very low-fat diet may not be the best practice for their performance," said Peter J. Horvath, UB associate professor of nutrition and physiology and a lead researcher. "If you want the calories necessary to do high-intensity training, you need to liberate yourself from a low-fat diet. We found also that in terms of cardiovascular risk factors, runners on a high-fat diet did not increase their cardiovascular risk factors, while on a low-fat diet, some of the cardiovascular risk factors were increased, similar to those of sedentary individuals."
Participants in the study were male and female runners between the ages of 18 and 53 who ran an average of 40 miles per week. Some were top-ranked regional competitors. Before beginning the study, the researchers established the fat level of each participant's current diet, which averaged about 20 percent. Blood pressure, heart rate, percentage of body fat, body weight, total cholesterol, HDL cholesterol, apoprotein levels-a more definitive measure of LDL and HDL-and serum triglycerides were measured. Subjects also were put through a series of endurance and VO2 max-oxygen consumption-tests.
All subjects then spent four weeks on the low-and medium-fat diets, with original assessments and testing repeated between diets. Only 12 subjects were able to raise their dietary fat close to the 45-percent level. This group spent an additional four weeks at that level and all initial tests were repeated at the end of the study.
Results of the performance tests on the medium-fat diet compared to the low-fat diet showed that endurance time increased 14 percent while the decrease in force after the endurance run was significantly less-11 percent. While endurance time did not increase on the high-fat diet, lactate levels were lower, indicating more efficient energy metabolism.
"The dietary intake of vitamin E, calcium, magnesium and zinc were at or below the recommended levels on the low-fat diet. As individuals increased their total calories and dietary fat, levels of zinc, magnesium, calcium and vitamin E also increased," Horvath said. The distance runners in this study did not have any negative effects on performance, nutrition or health on the high-fat diet," Horvath said. "Endurance athletes require a lot of calories. A very-low-fat diet for these athletes may not provide the required nutrition. A higher-fat diet may result in more energy availability and other metabolic, nutritional and performance advantages."
Other researchers in the study were Colleen K. Eagen and Jill Rowland, master's degree candidates in UB's nutrition program; John J. Leddy, UB clinical assistant professor of orthopaedics, medicine and family medicine, and David R. Pendergast, UB professor of physiology. The study was funded in part by an educational grant from Mars, Inc.
Study shows a low-fat diet may hinder, not help, athletes
By LOIS BAKER
News Services Staff
RESEARCHERS AT UB have shown that, contrary to prevailing recommendations, trained athletes who consume a very low-fat diet may be hindering their performance rather than enhancing it.
Results of a study of 25 long-distance runners from Western New York who consumed diets consisting of low, medium and high percentages of fat-15, 30 and 45 percent, respectively-showed that endurance time increased and that there was more muscle strength after an exhausting run when the percentage of dietary fat was increased.
In addition, levels of lactic acid, a measure of oxygen delivery, decreased after four weeks on the high-fat diet, indicating an increase in energy reserve.
Study results were presented April 14 at the annual meeting of the Federation of American Societies for Experimental Biology.
The athletes couldn't consume enough calories to meet the energy needs of their training on the low-fat diet. In addition, HDL cholesterol levels were lower on the 15-percent-fat regimen, indicating implications for cardiovascular risk factors.
This study is a follow-up to research reported in 1994 that showed similar results.
"Our conclusion is, for trained distance runners, a very low-fat diet may not be the best practice for their performance," said Peter J. Horvath, UB associate professor of nutrition and physiology and a lead researcher. "If you want the calories necessary to do high-intensity training, you need to liberate yourself from a low-fat diet. We found also that in terms of cardiovascular risk factors, runners on a high-fat diet did not increase their cardiovascular risk factors, while on a low-fat diet, some of the cardiovascular risk factors were increased, similar to those of sedentary individuals."
Participants in the study were male and female runners between the ages of 18 and 53 who ran an average of 40 miles per week. Some were top-ranked regional competitors. Before beginning the study, the researchers established the fat level of each participant's current diet, which averaged about 20 percent. Blood pressure, heart rate, percentage of body fat, body weight, total cholesterol, HDL cholesterol, apoprotein levels-a more definitive measure of LDL and HDL-and serum triglycerides were measured. Subjects also were put through a series of endurance and VO2 max-oxygen consumption-tests.
All subjects then spent four weeks on the low-and medium-fat diets, with original assessments and testing repeated between diets. Only 12 subjects were able to raise their dietary fat close to the 45-percent level. This group spent an additional four weeks at that level and all initial tests were repeated at the end of the study.
Results of the performance tests on the medium-fat diet compared to the low-fat diet showed that endurance time increased 14 percent while the decrease in force after the endurance run was significantly less-11 percent. While endurance time did not increase on the high-fat diet, lactate levels were lower, indicating more efficient energy metabolism.
"The dietary intake of vitamin E, calcium, magnesium and zinc were at or below the recommended levels on the low-fat diet. As individuals increased their total calories and dietary fat, levels of zinc, magnesium, calcium and vitamin E also increased," Horvath said. The distance runners in this study did not have any negative effects on performance, nutrition or health on the high-fat diet," Horvath said. "Endurance athletes require a lot of calories. A very-low-fat diet for these athletes may not provide the required nutrition. A higher-fat diet may result in more energy availability and other metabolic, nutritional and performance advantages."
Other researchers in the study were Colleen K. Eagen and Jill Rowland, master's degree candidates in UB's nutrition program; John J. Leddy, UB clinical assistant professor of orthopaedics, medicine and family medicine, and David R. Pendergast, UB professor of physiology. The study was funded in part by an educational grant from Mars, Inc.
Senior Member
Exibit A
Tour De France
Carbs carbs and more carbs
Thanks for playing, please drive thru
Edit: Going thru your sudies i see 2 things. Low fat may have faults. Which is what ive always said. Its also why the 'recomended' fat is 30%. In the studies, 30% seems to be the best. With problems in both extremes of HC and HF.
Observation 2. When an athelete is trainign hard he can survive on damn near anything.
I stilll say the recomended balanced diet is best, and thats what I get from your studies also
Tour De France
Carbs carbs and more carbs
Thanks for playing, please drive thru
Edit: Going thru your sudies i see 2 things. Low fat may have faults. Which is what ive always said. Its also why the 'recomended' fat is 30%. In the studies, 30% seems to be the best. With problems in both extremes of HC and HF.
Observation 2. When an athelete is trainign hard he can survive on damn near anything.
I stilll say the recomended balanced diet is best, and thats what I get from your studies also

Senior Member
AnthonyG
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Quote:
Tour De France
Carbs carbs and more carbs
Thanks for playing, please drive thru
Edit: Going thru your sudies i see 2 things. Low fat may have faults. Which is what ive always said. Its also why the 'recomended' fat is 30%. In the studies, 30% seems to be the best. With problems in both extremes of HC and HC.
Observation 2. When an athelete is trainign hard he can survive on damn near anything.
I stilll say the recomended balanced diet is best, and thats what I get from your studies also
Well I didn't read any downside from "high" fat diets in those studies. Originally Posted by Jarery
Exibit ATour De France
Carbs carbs and more carbs
Thanks for playing, please drive thru
Edit: Going thru your sudies i see 2 things. Low fat may have faults. Which is what ive always said. Its also why the 'recomended' fat is 30%. In the studies, 30% seems to be the best. With problems in both extremes of HC and HC.
Observation 2. When an athelete is trainign hard he can survive on damn near anything.
I stilll say the recomended balanced diet is best, and thats what I get from your studies also
As I've said before i don't disagree with balance and in my view 45% fat is perfectly balanced and due to the calorie dense nature of fats its not realy a lot. OK I don't count anything but I would expect my fat intake to be around 60% of calories and I could hit 80% of calories on some days but not every day!
EDIT: OK the TDF example. I'm always reading here that the TDF riders cant eat enough to keep the weight on so maybe that's the answer. More fat! It takes someone to break away from the orthodoxy before you can see the difference in athletes performance and with companies who make high sugar sports foods sponsoring teams there probably a disincentive for any team to try something different.
Regards, Anthony
Senior Member
Quote:
EDIT: OK the TDF example. I'm always reading here that the TDF riders cant eat enough to keep the weight on so maybe that's the answer. More fat! It takes someone to break away from the orthodoxy before you can see the difference in athletes performance and with companies who make high sugar sports foods sponsoring teams there probably a disincentive for any team to try something different.
Regards, Anthony
Maybe the companies that make Slim Jims and Mazola can sponser a team.Originally Posted by AnthonyG
EDIT: OK the TDF example. I'm always reading here that the TDF riders cant eat enough to keep the weight on so maybe that's the answer. More fat! It takes someone to break away from the orthodoxy before you can see the difference in athletes performance and with companies who make high sugar sports foods sponsoring teams there probably a disincentive for any team to try something different.
Regards, Anthony
Oldbie bike racer
High-Carbohydrate Vs. High-Fat Diets In Trained Cyclists - Brief Article - Statistical Data Included...
Even the "high fat" people ate 30-40% carbs. Number of training hours per week of only 6 hours at the low end indicates a person who isn't really much of a bike racer. Eat only 30-40% carbs on that amount of hours and it wouldn't matter much.
Measured performance by measuring VO2max. This is really poor because even with NO training VO2max does not drop very much. Measuring race performances would be much more appropriate, or at least measuring performance at a variety of intensities.
Even the "high fat" people ate 30-40% carbs. Number of training hours per week of only 6 hours at the low end indicates a person who isn't really much of a bike racer. Eat only 30-40% carbs on that amount of hours and it wouldn't matter much.
Measured performance by measuring VO2max. This is really poor because even with NO training VO2max does not drop very much. Measuring race performances would be much more appropriate, or at least measuring performance at a variety of intensities.
Oldbie bike racer
Study shows a low-fat diet may hinder, not help, athletes
By LOIS BAKER
The athletes couldn't consume enough calories to meet the energy needs of their training on the low-fat diet.
<This is really poor methodology. Some of the athletes were simply not given enough to eat. Of course this would result in lower performances compared to a group that was given enough to eat.>
Results of the performance tests on the medium-fat diet compared to the low-fat diet showed that endurance time increased 14 percent while the decrease in force after the endurance run was significantly less-11 percent. While endurance time did not increase on the high-fat diet, lactate levels were lower, indicating more efficient energy metabolism.
<Increasing endurance time... is that a goal? Go slower, but longer? Lower lactate levels do not mean more efficient energy levels. It's very possible it means you went SLOWER. If you're not producing lactate then you will have a very hard time going reasonably fast.>
"The dietary intake of vitamin E, calcium, magnesium and zinc were at or below the recommended levels on the low-fat diet. As individuals increased their total calories and dietary fat, levels of zinc, magnesium, calcium and vitamin E also increased,"
<This is stupid methodology. Simply have them take some vitamins like so many athletes do. >
The study was funded in part by an educational grant from Mars, Inc.
<NO surprise they got what they wanted.>
Next...
By LOIS BAKER
The athletes couldn't consume enough calories to meet the energy needs of their training on the low-fat diet.
<This is really poor methodology. Some of the athletes were simply not given enough to eat. Of course this would result in lower performances compared to a group that was given enough to eat.>
Results of the performance tests on the medium-fat diet compared to the low-fat diet showed that endurance time increased 14 percent while the decrease in force after the endurance run was significantly less-11 percent. While endurance time did not increase on the high-fat diet, lactate levels were lower, indicating more efficient energy metabolism.
<Increasing endurance time... is that a goal? Go slower, but longer? Lower lactate levels do not mean more efficient energy levels. It's very possible it means you went SLOWER. If you're not producing lactate then you will have a very hard time going reasonably fast.>
"The dietary intake of vitamin E, calcium, magnesium and zinc were at or below the recommended levels on the low-fat diet. As individuals increased their total calories and dietary fat, levels of zinc, magnesium, calcium and vitamin E also increased,"
<This is stupid methodology. Simply have them take some vitamins like so many athletes do. >
The study was funded in part by an educational grant from Mars, Inc.
<NO surprise they got what they wanted.>
Next...
Oldbie bike racer
Quote:
Regards, Anthony
Do you really think with millions of dollars at stake the athletes won't be eating the best they possibly can? It doesn't matter who sponsors them because they'll eat whatever they want and need and the public will never know.Originally Posted by AnthonyG
I'm always reading here that the TDF riders cant eat enough to keep the weight on so maybe that's the answer. More fat! It takes someone to break away from the orthodoxy before you can see the difference in athletes performance and with companies who make high sugar sports foods sponsoring teams there probably a disincentive for any team to try something different.[/B]Regards, Anthony
Riddle me this Anthony, how long do you think it would take a partially dehydrated racer in the Tour to digest 4000 calories of fat each night? During the races they stop eating fat with about 2-3 hours to go because the fatty foods don't mix well with the intensities they have to deal with during those periods. Before then, they'll get maybe 30-40% of their calories from fat.
Senior Member
Quote:
Enhanced endurance in trained cyclists during moderate intensity exercise following 2 weeks adaptation to a high fat diet
Estelle V. Lambert1 Contact Information, David P. Speechly1, Steven C. Dennis1 and Timothy D. Noakes1
(1) Liberty Life Chair of Exercise and Sports Science, MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory 7925, Cape Town, South Africa
Accepted: 25 April 1994
Abstract These studies investigated the effects of 2 weeks of either a high-fat (HIGH-FAT: 70% fat, 7% CHO) or a high-carbohydrate (HIGH-CHO: 74% CHO, 12% fat) diet on exercise performance in trained cyclists (n = 5) during consecutive periods of cycle exercise including a Wingate test of muscle power, cycle exercise to exhaustion at 85% of peak power output [90% maximal oxygen uptake ( $$\dot V$$ O2max), high-intensity exercise (HIE)] and 50% of peak power output [60% $$\dot V$$ O2max, moderate intensity exercise (MIE)]. Exercise time to exhaustion during HIE was not significantly different between trials: nor were the rates of muscle glycogen utilization during HIE different between trials, although starting muscle glycogen content was lower [68.1 (SEM 3.9) vs 120.6 (SEM 3.8) mmol · kg –1 wet mass, P < 0.01] after the HIGH-FAT diet. Despite a lower muscle glycogen content at the onset of MIE [32 (SEM 7) vs 73 (SEM 6) mmol · kg –1 wet[/B] mass, HIGH-FAT vs HIGH-CHO, P < 0.01], exercise time to exhaustion during subsequent MIE was significantly longer after the HIGH-FAT diet [79.7 (SEM 7.6) vs 42.5 (SEM 6.8) min, HIGH-FAT vs HIGH-CHO, P<0.01]. Enhanced endurance during MIE after the HIGH-FAT diet was associated with a lower respiratory exchange ratio [0.87 (SEM 0.03) vs 0.92 (SEM 0.02), P<0.05], and a decreased rate of carbohydrate oxidation [1.41 (SEM 0.70) vs 2.23 (SEM 0.40) g CHO · min–1, P<0.05]. These results would suggest that 2 weeks of adaptation to a high-fat diet would result in an enhanced resistance to fatigue and a significant sparing of endogenous carbohydrate during low to moderate intensity exercise in a relatively glycogen-depleted state and unimpaired performance during high intensity exercise.
still waiting for one, just one, study proving sub anaerobic exercise (let's say anywhere between 80 - 85% effort level) performance is impaired by a trained athlete who has been given time to adapt to a high fat diet. just one reliable, well controlled study.Enhanced endurance in trained cyclists during moderate intensity exercise following 2 weeks adaptation to a high fat diet
Estelle V. Lambert1 Contact Information, David P. Speechly1, Steven C. Dennis1 and Timothy D. Noakes1
(1) Liberty Life Chair of Exercise and Sports Science, MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory 7925, Cape Town, South Africa
Accepted: 25 April 1994
Abstract These studies investigated the effects of 2 weeks of either a high-fat (HIGH-FAT: 70% fat, 7% CHO) or a high-carbohydrate (HIGH-CHO: 74% CHO, 12% fat) diet on exercise performance in trained cyclists (n = 5) during consecutive periods of cycle exercise including a Wingate test of muscle power, cycle exercise to exhaustion at 85% of peak power output [90% maximal oxygen uptake ( $$\dot V$$ O2max), high-intensity exercise (HIE)] and 50% of peak power output [60% $$\dot V$$ O2max, moderate intensity exercise (MIE)]. Exercise time to exhaustion during HIE was not significantly different between trials: nor were the rates of muscle glycogen utilization during HIE different between trials, although starting muscle glycogen content was lower [68.1 (SEM 3.9) vs 120.6 (SEM 3.8) mmol · kg –1 wet mass, P < 0.01] after the HIGH-FAT diet. Despite a lower muscle glycogen content at the onset of MIE [32 (SEM 7) vs 73 (SEM 6) mmol · kg –1 wet[/B] mass, HIGH-FAT vs HIGH-CHO, P < 0.01], exercise time to exhaustion during subsequent MIE was significantly longer after the HIGH-FAT diet [79.7 (SEM 7.6) vs 42.5 (SEM 6.8) min, HIGH-FAT vs HIGH-CHO, P<0.01]. Enhanced endurance during MIE after the HIGH-FAT diet was associated with a lower respiratory exchange ratio [0.87 (SEM 0.03) vs 0.92 (SEM 0.02), P<0.05], and a decreased rate of carbohydrate oxidation [1.41 (SEM 0.70) vs 2.23 (SEM 0.40) g CHO · min–1, P<0.05]. These results would suggest that 2 weeks of adaptation to a high-fat diet would result in an enhanced resistance to fatigue and a significant sparing of endogenous carbohydrate during low to moderate intensity exercise in a relatively glycogen-depleted state and unimpaired performance during high intensity exercise.
Oldbie bike racer
Quote:
Originally Posted by mrfreddy
still waiting for one, just one, study proving sub anaerobic exercise (let's say anywhere between 80 - 85% effort level) performance is impaired by a trained athlete who has been given time to adapt to a high fat diet. just one reliable, well controlled study.
"Physical exercise as a modulator of adaptation to low and high carbohydrate and low and high fat intakes.
Miller SL, Wolfe RR.
Department of Surgery, University of Texas Medical Branch at Galveston, USA.
Quantification of the metabolic response aids in ascertaining the nature and extent of the energy requirements imposed by exercise. During high intensity exercise, virtually all of the energy is supplied by the net oxidation of glycogen while fat oxidation plays a more prominent role during lower intensity exercise. Therefore, the lower limit of carbohydrate required above resting needs is equal to the portion of the total energy cost derived from carbohydrate sources. There is no upper limit of additional carbohydrate intake that could be eaten to satisfy the extra caloric requirement since carbohydrate intake will restore any endogenous energy stores that were used during exercise, regardless of the intensity of exercise. The recommendation of a high carbohydrate intake to provide caloric balance in exercising individuals is supported by the observation that exercise performance at high intensity is improved by a high carbohydrate diet, and exercise performance at low intensity is relatively insensitive to the source of the caloric intake. Limited dietary studies are consistent with predictions based on the metabolic response. At exercise intensities below 65% VO2 max, the percent fat and carbohydrate in the diet makes little difference on exercise performance, provided adequate time is allowed to adapt to a high-fat diet. On the other hand, exercise ability during high-intensity exercise is significantly limited by a high-fat diet.
A consideration of importance beyond the aspect of energy balance is the anabolic effect of insulin on muscle protein synthesis after exercise. Provision of carbohydrate after exercise is likely to stimulate muscle protein synthesis to a greater extent than a corresponding amount of fat. Dietary fats may offer practical advantages to the athlete but if fats are consumed at the expense of carbohydrate intake, many established benefits of high carbohydrate intake in terms of performance may be sacrified."
Go back and read my posts where I've said exactly what the bold sections say, and that you could find it on PUBMED just like I did this morning.
Senior Member
here's the omnivore's take on this,
Quote:
23 March 2004 | Filed under Low Carb : Exercise
Do Athletes Really Need High-Carbohydrate Diets?
By Anthony Colpo.
March 22, 2004
Brian Maxwell, founder of the multimillion-dollar PowerBar empire and a former world-class marathon runner, died of a heart attack on Friday, March 19. Maxwell and his nutritionist wife Jennifer, co-founded the popular energy bar company in 1986, which they eventually sold to Nestle SA for a reported $375 million in 2000.
For those not familiar with PowerBars, they are a sugar-rich, low-fat bar that have been heavily promoted to recreational and competitive athletes alike. That a glorified candy bar could achieve such monumental success when marketed as an athletic aid is due in no small part to the widely-held misconception that "athletes need lots of carbohydrates for energy".
As this author found out the hard way during the nineties, regular vigorous physical activity does not guarantee protection against the deleterious effects of a high carbohydrate diet. Despite daily workouts, my "healthy" low-fat, high-complex carbohydrate diet raised my blood pressure and seriously disrupted my blood glucose metabolism. These effects vanished after commencing a low-carbohydrate diet.
Brian Maxwell joins the late Jim Fixx as yet another high-carb consuming runner whose athletic background did little to counter the health-destroying effects of excessive carbohydrate ingestion.
Athletic Nutrition: More Carbs or More Fat?
One of the problems with many athletes is that they simply do not eat enough to meet the energy needs of their training activities. A recent review by researchers from the University at Buffalo, New York, highlighted several studies in which subjects with reduced energy intakes (500 to 800 kcal/day below estimated expenditure) showed reduced endurance exercise times. Increasing the subjects' caloric intake to match expenditure by increasing carbohydrates significantly increased their time to exhaustion by approximately 20% at exercise intensities of 70% and 80% of Vo2max. However, increasing the total caloric intake to meet expenditure by using fat brought about further significant increases in endurance time - an extra 40% over and above that produced by consuming extra carbohydrates! In these studies, the percentage of fat was raised from 15% to between 30% and 42% of total calories, while carbohydrates were limited to 35-40% of calories.(1)
These studies not only show that low-fat, high-carbohydrate diets are in no way essential for optimal athletic performance, but are in fact inferior to higher fat diets.
Whether Maxwell's death attracts anywhere near the media attention that was awarded to the widely-misconstrued contents of the late Dr. Atkins' leaked death report remains to be seen, but athletes should know that the chronic consumption of high-carbohydrate diets may indeed have potentially adverse health consequences, which regular exercise may not necessarily ameliorate. Chronic consumption of a high-glycemic load diet has been linked to increased risk of heart disease,(2) breast cancer,(3) diabetes,(4,5) and pancreatic cancer.(6)
Related articles:
Popular Energy Bars Raise Blood Sugar and Insulin Levels
References
1) Pendergast DR, et al. A Perspective on Fat Intake in Athletes. Journal of the American College of Nutrition, 2000 19 (3): 345-350.
2) Liu S, et al. A prospective study of dietary glycemic load, carbohydrate intake, and risk of coronary heart disease in US women. American Journal of Clinical Nutrition, 2000; 71: 1455-1461.
3) Higginbotham S, et al. Dietary glycemic load and breast cancer risk in the Women's Health Study. Cancer Epidemiol Biomarkers Prev. 2004 Jan; 13 (1): 65-70.
4) Salmeron J, et al. Dietary fiber, glycemic load, and risk of NIDDM in men. Diabetes Care, 1997; 20 (4): 545-550.
5) Salmeron J, et al. Dietary fiber, glycemic load, and risk of non-insulin-dependent diabetes mellitus in women. Journal of the American Medical Association, Feb 12, 1997; 277 (6): 472-477.
6) Michaud DS, et al. Dietary Sugar, Glycemic Load, and Pancreatic Cancer Risk in a Prospective Study. Journal of the National Cancer Institute, 2002; 94: 1293-1300.
7) Shaw GM, et al. Neural tube defects associated with maternal periconceptional dietary intake of simple sugars and glycemic index. American Journal of Clinical Nutrition, 2003; 78 (5): 972-978.
Source: theomnivore.com
23 March 2004 | Filed under Low Carb : Exercise
Do Athletes Really Need High-Carbohydrate Diets?
By Anthony Colpo.
March 22, 2004
Brian Maxwell, founder of the multimillion-dollar PowerBar empire and a former world-class marathon runner, died of a heart attack on Friday, March 19. Maxwell and his nutritionist wife Jennifer, co-founded the popular energy bar company in 1986, which they eventually sold to Nestle SA for a reported $375 million in 2000.
For those not familiar with PowerBars, they are a sugar-rich, low-fat bar that have been heavily promoted to recreational and competitive athletes alike. That a glorified candy bar could achieve such monumental success when marketed as an athletic aid is due in no small part to the widely-held misconception that "athletes need lots of carbohydrates for energy".
As this author found out the hard way during the nineties, regular vigorous physical activity does not guarantee protection against the deleterious effects of a high carbohydrate diet. Despite daily workouts, my "healthy" low-fat, high-complex carbohydrate diet raised my blood pressure and seriously disrupted my blood glucose metabolism. These effects vanished after commencing a low-carbohydrate diet.
Brian Maxwell joins the late Jim Fixx as yet another high-carb consuming runner whose athletic background did little to counter the health-destroying effects of excessive carbohydrate ingestion.
Athletic Nutrition: More Carbs or More Fat?
One of the problems with many athletes is that they simply do not eat enough to meet the energy needs of their training activities. A recent review by researchers from the University at Buffalo, New York, highlighted several studies in which subjects with reduced energy intakes (500 to 800 kcal/day below estimated expenditure) showed reduced endurance exercise times. Increasing the subjects' caloric intake to match expenditure by increasing carbohydrates significantly increased their time to exhaustion by approximately 20% at exercise intensities of 70% and 80% of Vo2max. However, increasing the total caloric intake to meet expenditure by using fat brought about further significant increases in endurance time - an extra 40% over and above that produced by consuming extra carbohydrates! In these studies, the percentage of fat was raised from 15% to between 30% and 42% of total calories, while carbohydrates were limited to 35-40% of calories.(1)
These studies not only show that low-fat, high-carbohydrate diets are in no way essential for optimal athletic performance, but are in fact inferior to higher fat diets.
Whether Maxwell's death attracts anywhere near the media attention that was awarded to the widely-misconstrued contents of the late Dr. Atkins' leaked death report remains to be seen, but athletes should know that the chronic consumption of high-carbohydrate diets may indeed have potentially adverse health consequences, which regular exercise may not necessarily ameliorate. Chronic consumption of a high-glycemic load diet has been linked to increased risk of heart disease,(2) breast cancer,(3) diabetes,(4,5) and pancreatic cancer.(6)
Related articles:
Popular Energy Bars Raise Blood Sugar and Insulin Levels
References
1) Pendergast DR, et al. A Perspective on Fat Intake in Athletes. Journal of the American College of Nutrition, 2000 19 (3): 345-350.
2) Liu S, et al. A prospective study of dietary glycemic load, carbohydrate intake, and risk of coronary heart disease in US women. American Journal of Clinical Nutrition, 2000; 71: 1455-1461.
3) Higginbotham S, et al. Dietary glycemic load and breast cancer risk in the Women's Health Study. Cancer Epidemiol Biomarkers Prev. 2004 Jan; 13 (1): 65-70.
4) Salmeron J, et al. Dietary fiber, glycemic load, and risk of NIDDM in men. Diabetes Care, 1997; 20 (4): 545-550.
5) Salmeron J, et al. Dietary fiber, glycemic load, and risk of non-insulin-dependent diabetes mellitus in women. Journal of the American Medical Association, Feb 12, 1997; 277 (6): 472-477.
6) Michaud DS, et al. Dietary Sugar, Glycemic Load, and Pancreatic Cancer Risk in a Prospective Study. Journal of the National Cancer Institute, 2002; 94: 1293-1300.
7) Shaw GM, et al. Neural tube defects associated with maternal periconceptional dietary intake of simple sugars and glycemic index. American Journal of Clinical Nutrition, 2003; 78 (5): 972-978.
Source: theomnivore.com
Senior Member
here's a couple of quickies...
Quote:
American College of Sports Medicine looks at keto diets
A group of people following a ketogenic diet (10% carbs, high fat) were asked to maintain their normal activity level and to eat sufficient calories equal to maintenance. At the end of the study, subjects lost 2.8 kilograms of bodyweight (6.6 lbs), and 4% of bodyfat (peformed by DEXA analysis). Additionally, they gained 1.4 kilograms of lean mass (3.08 lbs).
(Med Sci Sport Exercise , 33(5): S336, 2001)
American College of Sports Medicine looks at keto diets
A group of people following a ketogenic diet (10% carbs, high fat) were asked to maintain their normal activity level and to eat sufficient calories equal to maintenance. At the end of the study, subjects lost 2.8 kilograms of bodyweight (6.6 lbs), and 4% of bodyfat (peformed by DEXA analysis). Additionally, they gained 1.4 kilograms of lean mass (3.08 lbs).
(Med Sci Sport Exercise , 33(5): S336, 2001)
Quote:
Low Carb Diet Alters Hormones
Dr. Jozel Langfort and colleagues from the Polish Academy of Sciences in Warsaw found that during exercise in people following low carb diet, adrenaline and growth hormone levels increase more than when people are on normal diet. Lactic acid levels were also lower.
(International Journal of Sports Nuritition and Exercise , 11: 248-257, 2001)
Low Carb Diet Alters Hormones
Dr. Jozel Langfort and colleagues from the Polish Academy of Sciences in Warsaw found that during exercise in people following low carb diet, adrenaline and growth hormone levels increase more than when people are on normal diet. Lactic acid levels were also lower.
(International Journal of Sports Nuritition and Exercise , 11: 248-257, 2001)
Senior Member
ok, I'll take a break now, but I really would like to see actual studies that support the various knocks on a low carb diet, specifically for someone in OP's situation, just wants to lose wt. and get reasonably fit.
btw, there are LOADS more studies suggesting at the very least that the low carb avenue ought to be considered and investigated further.
as to why pro athletes prefer to carb up, it could be sort of along the lines of why does the American Diabetes Association, with lives literally in the balance, refuse to consider the low carb approach? even though it is clearly superior to their own politically correct guidelines that are sadly less effective. for more on that, read this https://weightoftheevidence.blogspot.com/
btw, there are LOADS more studies suggesting at the very least that the low carb avenue ought to be considered and investigated further.
as to why pro athletes prefer to carb up, it could be sort of along the lines of why does the American Diabetes Association, with lives literally in the balance, refuse to consider the low carb approach? even though it is clearly superior to their own politically correct guidelines that are sadly less effective. for more on that, read this https://weightoftheevidence.blogspot.com/
Oldbie bike racer
"One of the problems with many athletes is that they simply do not eat enough to meet the energy needs of their training activities. A recent review by researchers from the University at Buffalo, New York, highlighted several studies in which subjects with reduced energy intakes (500 to 800 kcal/day below estimated expenditure) showed reduced endurance exercise times. Increasing the subjects' caloric intake to match expenditure by increasing carbohydrates significantly increased their time to exhaustion by approximately 20% at exercise intensities of 70% and 80% of Vo2max. However, increasing the total caloric intake to meet expenditure by using fat brought about further significant increases in endurance time - an extra 40% over and above that produced by consuming extra carbohydrates! In these studies, the percentage of fat was raised from 15% to between 30% and 42% of total calories, while carbohydrates were limited to 35-40% of calories.(1)
Yes, so they went to a diet that included 30 and 42% fat and did better than when they weren't given enough calories to eat. WOW! And then they exercised longer and slower on the diet with 30 and 42% fat. Great! Sounds like the way to go for your 4+ hour bike rides.
Yes, so they went to a diet that included 30 and 42% fat and did better than when they weren't given enough calories to eat. WOW! And then they exercised longer and slower on the diet with 30 and 42% fat. Great! Sounds like the way to go for your 4+ hour bike rides.
Oldbie bike racer
Quote:
as to why pro athletes prefer to carb up, it could be sort of along the lines of why does the American Diabetes Association, with lives literally in the balance, refuse to consider the low carb approach? even though it is clearly superior to their own politically correct guidelines that are sadly less effective. for more on that, read this https://weightoftheevidence.blogspot.com/
More bull from the oxy-moron called mr. freddy. Athletes can have millions of dollars at stake trying to achieve the best performances possible. Some even cheat to do that yet they still won't use a high fat diet. And you think they stick what they know works best because of political correctness? That's pretty funny! and sad for you.Originally Posted by mrfreddy
as to why pro athletes prefer to carb up, it could be sort of along the lines of why does the American Diabetes Association, with lives literally in the balance, refuse to consider the low carb approach? even though it is clearly superior to their own politically correct guidelines that are sadly less effective. for more on that, read this https://weightoftheevidence.blogspot.com/
Next.
Senior Member
Quote:
Next.
Originally Posted by WarrenG
More bull from the oxy-moron called mr. freddy. Athletes can have millions of dollars at stake trying to achieve the best performances possible. Some even cheat to do that yet they still won't use a high fat diet. And you think they stick what they know works best because of political correctness? That's pretty funny! and sad for you.Next.
a perfect example of a the mindset involved here. dogmatic. childish insults. attacking the messenger. making unsupported claims.
still waiting for actual studies supporting your p.o.v. "it's all on pubmed" is sounding increasingly hollow..
Oldbie bike racer
Quote:
Even the "high fat" people ate 30-40% carbs. Number of training hours per week of only 6 hours at the low end indicates a person who isn't really much of a bike racer. Eat only 30-40% carbs on that amount of hours and it wouldn't matter much.
Measured performance by measuring VO2max. This is really poor because even with NO training VO2max does not drop very much. Measuring race performances would be much more appropriate, or at least measuring performance at a variety of intensities.
Originally Posted by WarrenG
High-Carbohydrate Vs. High-Fat Diets In Trained Cyclists - Brief Article - Statistical Data Included...Even the "high fat" people ate 30-40% carbs. Number of training hours per week of only 6 hours at the low end indicates a person who isn't really much of a bike racer. Eat only 30-40% carbs on that amount of hours and it wouldn't matter much.
Measured performance by measuring VO2max. This is really poor because even with NO training VO2max does not drop very much. Measuring race performances would be much more appropriate, or at least measuring performance at a variety of intensities.
To explain further...
VO2max is a specific intensity but it does not say anything about how much power or speed a person is able to produce at a given intensity. In most ways it's like saying x% of MHR. What is much more important (in terms of evaluating performance at VO2max) is how fast a person can ride/run/swim, etc. _at_ their VO2max, or at some given percentage of their VO2max.
So a study that says, "after we fed the athletes x for 6 weeks their VO2max didn't change" isn't really saying much about their performance at the intensity referred to as VO2max.
If a person says, "My VO2max is 65mg/kg", the question to ask is, "Oh, and how fast can you go at your VO2max?" Training is used to improve how fast you can go at your VO2max.