Action Personal Training Practice Test

ATP/PC provides energy for how long?

up to 10 seconds up to 30 seconds up to 2 minutes up to 5 minutes

Correct Answer:

up to 10 seconds

Explanation:

The ATP/PC system provides energy for very short, high-intensity efforts by using stored ATP and phosphocreatine in the muscles. This immediate energy source can sustain maximal effort for only a brief moment because the phosphocreatine stores are limited and are used up quickly. In practice, that rapid energy supply lasts about 10 seconds at most. Once those stores are depleted, other energy systems—like anaerobic glycolysis and the aerobic system—take over to continue the activity. So, this system powers efforts on the order of a few seconds, with around ten seconds being the typical upper limit.

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