Better to be in shape
Interesting, large, though retrospective study, says good cardiac fitness is more important that avoiding cardiovascular disease, diabetes, or even smoking: https://health.clevelandclinic.org/b...e-study-finds/
Interestingly enough, for randonneurs and other "extreme" athletes, there's no upper limit. “'We found in our study there is no limit to how much exercise is too much,' says Wael Jaber, MD, a cardiologist and senior author of the study." At first reading, this sounds like very good news. I haven't read the paper, though, so there may be some limitations that were skimmed over in the news release. |
Originally Posted by pdlamb
(Post 20629316)
Interesting, large, though retrospective study, says good cardiac fitness is more important that avoiding cardiovascular disease, diabetes, or even smoking: https://health.clevelandclinic.org/b...e-study-finds/
Interestingly enough, for randonneurs and other "extreme" athletes, there's no upper limit. “'We found in our study there is no limit to how much exercise is too much,' says Wael Jaber, MD, a cardiologist and senior author of the study.". Because I don't for a second believe that racing flat out for hours at a time is good for you like elite cyclists, runners, etc., are prone to do. |
Originally Posted by rubiksoval
(Post 20630242)
No limit to how much low-end aerobic exercise is too much?
Because I don't for a second believe that racing flat out for hours at a time is good for you like elite cyclists, runners, etc., are prone to do. |
Good article.
Here is another article https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5514203/ Towards aging well: Use it or lose it: Exercise, epigenetics and cognition I have been interested in epigenetic changes in DNA and the role of exercise. The article discusses HIIT efforts and their role on aging and longevity and how exercise up regulates genes. Although many of the molecular pathways remain to be fully identified, here we discuss how physical activity and exercise is understood to produce changes in the human epigenome, which have the potential to enhance cognitive and psychological health, improve muscular fitness, and lead to better aging with improved quality of life in older age. These authors concluded that that while strength training was effective at building muscle mass, high-intensity interval training (HIIT) yielded the biggest benefits at the cellular level. The younger volunteers in the interval training group saw a 49% increase in mitochondrial capacity, and the older volunteers saw an even more dramatic 69% increase. Interval training also improved volunteers’ insulin sensitivity, which indicated a lower likelihood of developing diabetes. These researchers therefore concluded that supervised HIIT appeared to be an effective recommendation to improve cardio-metabolic health parameters in older adults. HIIT produced a pattern of gene expression independent of age, a robust increase in transcriptional and translational regulation of muscle growth, induced a strong up regulation of mitochondrial proteins and improved the age-related decline in muscle mitochondria. Humans may tolerate a lot of low intensity aerobic exercise and it has proven ability improve cardiac health, it seems that doses of high intensity interval training may prove even more valuable. |
Rowan had an accident in March. In the early days, the doctors thought he would end up in a full-care nursing home. He was in Post Traumatic Amnesia so long, his brain injury was classified as "extremely severe".
But he has amazed everyone. He is not fully recovered, but he has recovered a lot more than expected. And we're out walking and cycling (a little bit) again. There were a lot of people praying for him from all over the world. But he also had health and fitness in his favour.
That's enough to give us motivation to continue to lead reasonably healthy active lives. And for me, through all of this, exercise has sure helped ease some of the stress. |
I can attest to a converse fact, that backing off exercise, has a negative effect on fitness
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Originally Posted by DeadGrandpa
(Post 20630448)
Is low-end aerobic exercise really the same as "racing flat out for hours at a time"? I'm far from being an elite cyclist, but I definitely enjoy hours of low end aerobic exercise, bicycling at a touring pace, 12-13 mph. It just seems that high end aerobic exercise is the realm of elite cyclists, not low end.
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And the article I posted: https://www.brainline.org/blog/getti...ou-should-care
Says: "The good news is that you don’t need to be a daily cyclist to get this benefit. Shared by the doctor who presented at our group, thirty minutes of exercise, three times a week, will release BDNF’s and speed the neuro healing process." |
Originally Posted by pdlamb
(Post 20629316)
“'We found in our study there is no limit to how much exercise is too much,' says Wael Jaber, MD, a cardiologist and senior author of the study."
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Originally Posted by rubiksoval
(Post 20630242)
No limit to how much low-end aerobic exercise is too much?
Because I don't for a second believe that racing flat out for hours at a time is good for you like elite cyclists, runners, etc., are prone to do. Also, people evolved to be long distance runners, a human can run a marathon faster than a horse can. We didn't evolve to run 4 minute miles though, just enough to escape predators and run down big prey. |
There is this https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3538475/
In some individuals, long-term excessive endurance ET may cause adverse structural and electrical cardiac remodeling, including fibrosis and stiffening of the atria, RV, and large arteries. This theoretically might provide a substrate for atrial and ventricular arrhythmias and increase CV risk. Further investigation is warranted to identify the exercise threshold for potential toxicity, screening for at-risk individuals, and ideal ET regimens for optimizing CV health. For now, on the basis of animal and human data, CV benefits of vigorous aerobic ET appear to accrue in a dose-dependent fashion up to about 1 hour daily, beyond which further exertion produces diminishing returns and may even cause adverse CV effects in some individuals. Maybe the first article posted is the further investigation warranted. This animal study found that daily excessive, strenuous, uninterrupted running replicated the adverse cardiac structural remodeling and proarrhythmia substrate noted in observational studies of extreme endurance athletes. These findings support the hypothesis that in some individuals, long-term strenuous daily endurance ET, such as marathon running or professional long-distance cycling, in some individuals may cause cardiac fibrosis (especially in the atria and the RV and interventricular septum), diastolic dysfunction, and increased susceptibility to atrial and ventricular arrhythmias. Many previous animal studies have also found acute, adverse cardiac effects of prolonged (up to 6 hours) endurance exercise, sometimes employing a rat model of cold-water swimming in which the animals were forced to swim to avoid drowning.25 These studies are of uncertain clinical relevance because of the excessively stressful nature of the imposed exercise. It is quite a jump from mice to men (or rats) but hey, maybe professional cyclists are close to rats in genetic makeup.:D |
Things like "The Haywire Heart" and multiple 20-something year old cyclists dropping dead of heart attacks gives me pause.
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James O’Keefe the cardiologist (not that undercover reporter) has done some research on this. He certainly gave me some pause. I heard a more recent interview with him on Sirius XM Doctor Radio and it looks like 45 minutes 5 days a week is the upper limit of what’s beneficial for cardiovascular exercise. Low intensity cardio like walking is fine to do in any quantity. There isn’t much doubt left in my mind that the higher intensity interval training, done in sufficient quantity, is bad for your heart. I gave up the FTP intervals a 2 years ago and don’t plan to start them up ever again. |
Originally Posted by rubiksoval
(Post 20630242)
No limit to how much low-end aerobic exercise is too much?
Because I don't for a second believe that racing flat out for hours at a time is good for you like elite cyclists, runners, etc., are prone to do. Anyway, the bottom line is that there is no downside, in terms of all-cause mortality, to maximizing cardiovascular fitness. In this cohort study of 122 007 consecutive patients undergoing exercise treadmill testing, cardiorespiratory fitness was inversely associated with all-cause mortality without an observed upper limit of benefit. |
I haven't had a chance to read the article, but there really are no down sides to exercise. If there is a magic bullet to your health it is exercise. Yes, too much of anything is not good for you, and for those people who spend an inordinate amount of time on exercise that isn't considered 'training' for a sport, there's probably some other underlying mental/emotional condition present.
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Originally Posted by pdlamb
(Post 20629316)
“'We found in our study there is no limit to how much exercise is too much,' says Wael Jaber, MD, a cardiologist and senior author of the study."
Those who live longer choose to exercise, not the other way round. |
Originally Posted by chelvel
(Post 20637416)
Sounds like a BS... He never heard about overtraining or that a big sport is unhealthy activity?
Those who live longer choose to exercise, not the other way round. What's "a big sport"? |
Originally Posted by Machka
(Post 20637636)
Most people don't come anywhere near overtraining.
Originally Posted by Machka
(Post 20637636)
What's "a big sport"?
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Originally Posted by wolfchild
(Post 20637666)
..Believe it or not, there are people who will sacrifice health in the name of performance.
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Pretty funny to see how many people's opinions are unaffected by facts. I suppose we are just a subset of the Big World. Don't know why I would find it odd to see here. I mostly ride with what one might call "high-performance cyclists." I don't know of anyone who has ever overtrained. Over-reached, sure, but that's a normal part of training. One wants to do that once in awhile. If you never over-reach, you could be training harder.
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Originally Posted by Carbonfiberboy
(Post 20637843)
Pretty funny to see how many people's opinions are unaffected by facts. I suppose we are just a subset of the Big World. Don't know why I would find it odd to see here. I mostly ride with what one might call "high-performance cyclists." I don't know of anyone who has ever overtrained. Over-reached, sure, but that's a normal part of training. One wants to do that once in awhile. If you never over-reach, you could be training harder.
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Originally Posted by Machka
(Post 20637636)
Most people don't come anywhere near overtraining.
Originally Posted by Machka
(Post 20637636)
What's "a big sport"?
Originally Posted by gregf83
(Post 20637883)
Training is a self-limiting activity. Not many are motivated enough and have sufficient time available to overtrain.
"We found in our study there is no limit to how much exercise is too much." Are they asking for fonds for a better study? |
Originally Posted by chelvel
(Post 20637416)
Sounds like a BS... He never heard about overtraining or that a big sport is unhealthy activity?
Those who live longer choose to exercise, not the other way round. |
Originally Posted by pdlamb
(Post 20638569)
Do you know of any refereed study showing that overtraining or "big sport" reduces life span on a population?
Do you know of any refereed study showing that overtraining or "big sport" not reduces life span on a population? |
Originally Posted by Carbonfiberboy
(Post 20633592)
This study just came out in JAMA, so I had another chance to look at it. I think some here might be misinterpreting the study. It's a study of 122,007 consecutive patients who had to take a treadmill test. They were ranked, not by volume of training or anything like that, but by performance on the test. IOW, you'd kill it. The ranking judged "Elite," the top 97.7% ranked by performance, had the fewest deaths from all causes over the next ~10 years. And as you know, you get to be elite by doing lots of intervals and riding your guts out. When I took mine at 72, with a left bundle branch blockage, I was ranked as a 47 y.o. highly fit individual, though the doc didn't give me my percentage rank.
Anyway, the bottom line is that there is no downside, in terms of all-cause mortality, to maximizing cardiovascular fitness. Ultimately though, I have no doubt that the people doing too much are few and far between. |
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