A runner notices that after 90 minutes, her energy feels steadier than at the start. Which system is now...

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A runner notices that after 90 minutes, her energy feels steadier than at the start. Which system is now dominant?
The phosphate-releasing system from earlier effort
The oxygen-based aerobic system
The glucose-only short-term system
The short, stored ATP system for quick bursts

SnapAndSolve AI · Accepted Answer

After 90 minutes of running, the dominant energy system is the oxygen-based aerobic system. Initially, during the first moments of high intensity, the body relies on the short, stored ATP system and the glucose-only short-term system (anaerobic pathway) for quick energy bursts. However, as the run continues past the 90-minute mark, the body shifts to predominantly using the aerobic system, which relies on oxygen to metabolize carbohydrates and fats for sustained energy. This shift contributes to a steadier energy level, as aerobic metabolism is more efficient for prolonged activities, reducing the likelihood of rapid fatigue associated with anaerobic processes.

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A runner notices that after 90 minutes, her energy feels steadier than at the start. Which system is now...

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