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Wilmore also notes that the substrate burned during exercise doesn't matter when the goal is to lose body fat. A more correct explanation is that rmr low intensity, steady state aerobic exercise uses a greater percentage of fat than high intensity exercise, but these rmr fat calories (and carbohydrate calories) rmr are being burned at a relatively slow rate (e.g. four to five calories per minute.) By comparison, high intensity exercise uses a smaller percentage of fat, but this smaller percentage (along with carbohydrate) is being burned at a much higher rate (e.g. 10 to 13 calories per minute.) Thus, as Wilmore points out, the total amount of fat burned is greater during high intensity exercise (70 to 75% of V02Max) compared to a similar duration of low-moderate intensity exercise (40-60% of VO2Max). Many aerobic instructors have confused the proportion of fat used as fuel with the more important rate of fuel utilization, which is a key concept in exercise induced body fat loss.
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