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-   -   Something interesting from my biochem class (http://www.bikeforums.net/clydesdales-athenas-200-lb-91-kg/355840-something-interesting-my-biochem-class.html)

kchunks 10-22-07 01:24 PM

Something interesting from my biochem class
 
According to my biochemistry professor the average 70 kg male has 420,000 kilojoules in energy reserves stored as fat. I am a little over 100 kg (and probably more stout than a "normal" male) so to keep the numbers easy I will say I weigh in at 105 kg which if you multiply 420000*1.5 you get 630,000 kJ. Now, one joule is equal to just over four calories. Seeing as how we're dealing with kilojoules and there are 1000 calories in one Calorie (aka kilocal or what you're used to reading on the nutrition facts) we can easily make that jump that there are just over four kJ in one Calorie. So, if I take 630,000 and divide by 4.184 I end up with 150,574 Calories of fuel reserves of just fat (fat is by far the largest reserve, though). Now, according to my undergrad physiology professor a person needs 100 Calories to run/walk/travel by foot for one mile. So, do I have 1,500 miles in me? Obviously not as a lot of this energy will be used for several other metabolic functions but it is interesting to think about.

In case you're curious about the rest of the stats for a 70 kg male-
170 kJ in glucose
2500 kJ in glycogen
100,000 kJ in protein (mostly from muscle)

icebike 10-22-07 01:43 PM

Quote:

Originally Posted by kchunks (Post 5500288)
According to my biochemistry professor the average 70 kg male has 420,000 kilojoules in energy reserves stored as fat. I am a little over 100 kg (and probably more stout than a "normal" male) so to keep the numbers easy I will say I weigh in at 105 kg which if you multiply 420000*1.5 you get 630,000 kJ. Now, one joule is equal to just over four calories. Seeing as how we're dealing with kilojoules and there are 1000 calories in one Calorie (aka kilocal or what you're used to reading on the nutrition facts) we can easily make that jump that there are just over four kJ in one Calorie. So, if I take 630,000 and divide by 4.184 I end up with 150,574 Calories of fuel reserves of just fat (fat is by far the largest reserve, though). Now, according to my undergrad physiology professor a person needs 100 Calories to run/walk/travel by foot for one mile. So, do I have 15,000 miles in me? Obviously not as a lot of this energy will be used for several other metabolic functions but it is interesting to think about.

In case you're curious about the rest of the stats for a 70 kg male-
170 kJ in glucose
2500 kJ in glycogen
100,000 kJ in protein (mostly from muscle)

Umm are you sure you don't mean 1,500 miles?
Anyway, all of those calcs are approximate, since an increase in mass will cause an increase in Calories burned per mile. Nonetheless interesting calc. I'm glad you posted it.

kchunks 10-22-07 01:58 PM

Quote:

Originally Posted by icebike (Post 5500352)
Umm are you sure you don't mean 1,500 miles?

Oops- That is what I meant. I had to edit for a few spelling errors but forgot to look at the numbers.

Yes, those are all approximations because everyone is different. People have different percentage makeups and the you get into different diets and all of the little things that make us unique. As a whole, though, I thought it was interesting.

Tom Stormcrowe 10-22-07 03:16 PM

Theoretically, you do, but you will collapse long before finishing it if you were to try it with nothing but hydration support. What would happen is you would cannibalize muscle mass before the fat because muscle is a less efficient storage tissue, and you would at the least suffer severe muscular damage from the attempt as well as very likely liver damage due to glycogen depletion and subsequent low blood sugar and potential coma.

Fat takes little O2 and energy to maintain vs muscle taking very large amounts of energy and O2 n form of ATP and glucose and Glycogen. The Body tries to save the most efficient tissue for the last gasp of survival, and fat is the most efficient storage. You would also suffer significant cognitive impairment due to the fact that the brain can ONLY run on glucose.

dschorre 10-22-07 03:54 PM

If you allow for a 1600 Calorie nutritional daily need (1600 in and 1600 out) for normal daily activities, take in to effect riding 11 miles per day at an average speen of 11 MPH (this will burn 1300 calories) then you can burn 150,000 "extra" or "stored" calories in 115 days. there are arox. 3500 calories in 1 lb of fat. so in that 115 days you would lose .40 lbs of fat per day or 3 lbs per week. plus or minus a few here and there depending on what you start weight, level of exercise tolerence and endurance, whether is was anaerobic or aerobic exercise, hydration, hemiglobin count, male or female, and the last four digits of your great grandpa's social security number plus or minus 2.

rankin116 10-22-07 06:36 PM

Quote:

Originally Posted by dschorre (Post 5501090)
If you allow for a 1600 Calorie nutritional daily need (1600 in and 1600 out) for normal daily activities, take in to effect riding 11 miles per day at an average speen of 11 MPH (this will burn 1300 calories) then you can burn 150,000 "extra" or "stored" calories in 115 days. there are arox. 3500 calories in 1 lb of fat. so in that 115 days you would lose .40 lbs of fat per day or 3 lbs per week. plus or minus a few here and there depending on what you start weight, level of exercise tolerence and endurance, whether is was anaerobic or aerobic exercise, hydration, hemiglobin count, male or female, and the last four digits of your great grandpa's social security number plus or minus 2.

nice.

TallSteve 10-22-07 08:12 PM

hmmm....I have no idea what you guys are talking about.:o

Sandwarrior 10-22-07 08:27 PM

Not having ever taken a Physiology class, How then do you get the Fat to start burning, if it all comes from your muscle tissue first? I am a bit confused. What is the purpose then, of training and keepng your HR in the "fat Burning" zone.

I am going to get my second cup of coffee, and maybe I won't be so confused when I get back:D

Wogster 10-22-07 08:37 PM

Quote:

Originally Posted by dschorre (Post 5501090)
If you allow for a 1600 Calorie nutritional daily need (1600 in and 1600 out) for normal daily activities, take in to effect riding 11 miles per day at an average speen of 11 MPH (this will burn 1300 calories) then you can burn 150,000 "extra" or "stored" calories in 115 days. there are arox. 3500 calories in 1 lb of fat. so in that 115 days you would lose .40 lbs of fat per day or 3 lbs per week. plus or minus a few here and there depending on what you start weight, level of exercise tolerence and endurance, whether is was anaerobic or aerobic exercise, hydration, hemiglobin count, male or female, and the last four digits of your great grandpa's social security number plus or minus 2.

My Great Grandpa didn't have a social security number, so what happens to me?????

Air 10-22-07 10:10 PM

Quote:

Originally Posted by Sandwarrior (Post 5502852)
[FONT="Comic Sans MS"][SIZE="3"][COLOR="Teal"]Not having ever taken a Physiology class, How then do you get the Fat to start burning

Stove on medium and the cast iron skillet hot and rarin' to go.

breadbin 10-23-07 01:19 AM

I remember I worked out that if for some strange reason I was left on a desert island, I would be ok for 85 days! More or less the same thing.

Tom Stormcrowe 10-23-07 05:24 AM

Quote:

Originally Posted by Sandwarrior (Post 5502852)
Not having ever taken a Physiology class, How then do you get the Fat to start burning, if it all comes from your muscle tissue first? I am a bit confused. What is the purpose then, of training and keepng your HR in the "fat Burning" zone.

I am going to get my second cup of coffee, and maybe I won't be so confused when I get back:D

By supplementing protein to offset the initial protein burn and support your muscle mass. Your metabolism will switch from sugars to protein to fat and once you hit the fat burn is when you start healthy weight loss.

That's the problem with crash diets, by the way.....the weight you do lose is water and muscle and keep the fat :eek:

kchunks 10-23-07 02:58 PM

Wogsterca, you will never not be a clyde not that there is anything wrong with that. (I will always be one, too. But my grandfather had a social security number.)

The simple answer is that when needed your body will first burn carbohydrates and then burn fat when there is not enough carbohydrate to use. It uses fat instead of other things by using hormones to signal what the body should do. Fats are pretty much hydrocarbons. Glucose (and carbohydrates) have just as much oxygen in the molecule as the do carbon. That means that they (carbohydrates) are bulkier but require less from the body to turn it into usable energy. Fats, being long hydrocarbon chains, pack together very nicely and are therefore used for long term storage because a lot of molecules can be packed tightly. Also, my same undergrad professor told us that at a certain age your body will no longer generate more fat cells. However, it will just pack more fat into the cells that are already there.

dschorre 10-25-07 10:46 AM

Quote:

Originally Posted by Wogsterca (Post 5502928)
My Great Grandpa didn't have a social security number, so what happens to me?????

In that case, take your social security, add all the digitis together until you get a single digit.

ex. 111-12-1234 = 1+1+1+1+2+1+2+3+4 = 16 = 1+6 = 7 +/- 2

Then you have your grandfater's social security factor

Wogster 10-25-07 05:27 PM

Quote:

Originally Posted by dschorre (Post 5519334)
In that case, take your social security, add all the digitis together until you get a single digit.

ex. 111-12-1234 = 1+1+1+1+2+1+2+3+4 = 16 = 1+6 = 7 +/- 2

Then you have your grandfater's social security factor

I'm in Canada, I don't have a social security number either, do have a social insurance number, same formula should work, probably easier to just use the check digit (second from last).... Then again, because SINs are needed so rarely, I can never remember it, I need to replace my SIN card one of these days, it got wrecked in 1986, and I just keep putting off replacing it.:D


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