Phosphocreatine restoration to 50% after high-intensity effort takes approximately how long?

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Prepare for the AQA A-Level PE Energy Systems Exam. Study with comprehensive flashcards and multiple-choice questions, featuring hints and explanations. Ace your exam with confidence!

Multiple Choice

Phosphocreatine restoration to 50% after high-intensity effort takes approximately how long?

Explanation:
After a burst of high‑intensity effort, the stored phosphocreatine is rebuilt during recovery by using ATP produced mainly through aerobic metabolism. This resynthesis happens very quickly at first, so about half of the depleted phosphocreatine stores are restored in roughly 30 seconds. That rapid initial resynthesis is why 30 seconds is the best estimate for reaching about 50% restoration. Full restoration to pre‑exercise levels typically takes a few minutes (roughly 3–5 minutes), but the question specifically asks for the time to reach about 50%, which is around 30 seconds.

After a burst of high‑intensity effort, the stored phosphocreatine is rebuilt during recovery by using ATP produced mainly through aerobic metabolism. This resynthesis happens very quickly at first, so about half of the depleted phosphocreatine stores are restored in roughly 30 seconds. That rapid initial resynthesis is why 30 seconds is the best estimate for reaching about 50% restoration. Full restoration to pre‑exercise levels typically takes a few minutes (roughly 3–5 minutes), but the question specifically asks for the time to reach about 50%, which is around 30 seconds.

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