INFOGRAPHIC 16.5 Influence of Exercise Intensity on Energy System Use Relative energy system contribution to total energy expenditure for any given duration of maximal intensity exercise (e.g., the point at 3 minutes assumes that someone ran as far as possible in that time). Even for very brief, high-intensity exercise, aerobic systems make some contribution to ATP production, however, as exercise duration increases, so does the contribution aerobic metabolism makes to total energy supply.
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