Which of the following statements regarding carbohydrate and fat metabolism during exercise is true? the utilization of fat as an energy source is greatest at the highest exercise intensities e.g. greater than 85% VO2 max the greatest amount of glycogen is used at around 65% VO2 max carbohydrate supplementation during moderately intense exercise (e.g. 70-80% VO2 max) can help one to exercise longer until the onset of fatigue plasma glucose contributes more to energy provision than does muscle glycogen at 85% VO2 max
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