30 Aug '13, 5pm

How hot weather affects fat-burning vs carb-burning during exercise (not just b/c it feels harder):

Now let's push a little beyond Tim's initial question to ask another important one: does this kind of thing matter if you're trying to lose weight? Should you worry about the proportion of fat versus carbs that you're burning, or just the total amounts? The focus on proportion is the fallacy underlying the idea that you should exercise at a low intensity to stay in the "fat-burning zone." Sure, it's true that sitting on an exercise bike and moving your legs slowly with zero resistance burns mostly fat -- but 80% of 5 calories is still useless. Much better to move to a higher intensity and get a smaller proportion of a larger total. And as you get fitter, your body's ability to burn fat will increase, and so will the intensity at which fat-burning is maximized. Here's a graph from that Spanish study, showing whole-body fat oxidation in the heat for trained and untrained sub...

Full article: http://www.runnersworld.com/weight-loss/how-does-heat-aff...

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