Comment by csee
3 years ago
Well that's what the article says. The Hazda who walk 8-12 km a day burn the less calories as an average American (or the same after adjusting for body weight).
Also that Phelps thing is highly questionable. He says he "probably" burns 8-10k, not 12k. Not the type of statement you want to rely on to dismiss all this work.
I just have a hard time believing it to be true that no amount of exercise will increase the overall caloric expenditure. For example, I've done a few multi-week bike tours, and we ate an enormous amount of mostly pasta every day, and managed to peel off a few pounds each by the end of it.
It's strange. Go out in freezing weather and stand still;you'll get cold. Move about and you get warm. I find it unlikely that you can heat up without energy?
The article mentions a study that tracked energy expenditure of runners over many weeks, and found that the energy expenditure was much lower at the tail end of the experiment, suggesting the body gets accustomed to the activity somehow and burns less energy.
The study must have tracked non-runners, given the conclusion. If they were already runners and the conclusion is that they get accustomed to the activity, they'd already be accustomed and there'd be no tail end difference. So they most likely tested non-runners and had them start running. We get more efficient at physical exertion with practice. Better coordination of muscle groups. Finding a more efficient pace. Correcting form deficiencies. These all increase capability or reduce energy expenditure.
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Well one obvious adaptation is losing fat = less energy needed to move the body.
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