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Anonymous
>>127858 Sauce: http://www.cyclingnews.com/fitness/?id=letters2002_11_07
>...at intensity levels above about 80 percent, the contribution of fat oxidation to energy needs falls of very quickly, becoming very minimal at about 90 percent. At greater intensities, you're burning muscle glycogen. The ideal "fat-burning" range is 65-80 percent according to a recent study by Achten et al. Note also, that if you ingest carbohydrates prior to or during your ride, you may impair the fat oxidation process. So for rides shorter than about two hours, skip the pre-ride energy bar, stick with water in your bottle, and keep your intensity in the ideal fat-burning zone of 65-80 percent.
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