Figure 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.
