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AAAI ISMA Primary Aerobic And Group Fitness Instructor Certification Practice Test

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Aerobic glycolysis lasts about 15 minutes before glycogen stores are depleted. Which statement matches this duration?
Correct Answer:
About 15 minutes
Explanation:
Glycolysis under aerobic conditions is fueled by glycogen stores in muscle and liver, supplying ATP as long as those stores last. This pathway can sustain energy production for a limited period because glycogen is finite. As the 15-minute mark approaches, glycogen stores become depleted, and the body shifts more toward fat oxidation, which provides energy more slowly. That makes about 15 minutes the best match for how long aerobic glycolysis can effectively operate before glycogen depletion limits it. Shorter times would underestimate the duration that glycogen can support this pathway, while much longer times would imply a greater reliance on fat oxidation or other fuels than this glycogen-restricted window.

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