How long does the lactic acid energy system last?

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Study for the Advanced Subsidiary WJEC Physical Education Test. Engage with flashcards and multiple-choice questions, each providing hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

How long does the lactic acid energy system last?

Explanation:
The lactic acid energy system (anaerobic glycolysis) provides energy quickly without requiring oxygen. It can power high‑intensity work for up to about three minutes. It’s great for short bursts and efforts where oxygen delivery can’t meet demand, but it produces lactate and hydrogen ions that build up and cause fatigue, limiting how long it can be sustained. In practice, this system dominates for roughly up to a couple of minutes, and by around three minutes the aerobic system generally takes over for longer activity. That’s why three minutes is the best fit among the options.

The lactic acid energy system (anaerobic glycolysis) provides energy quickly without requiring oxygen. It can power high‑intensity work for up to about three minutes. It’s great for short bursts and efforts where oxygen delivery can’t meet demand, but it produces lactate and hydrogen ions that build up and cause fatigue, limiting how long it can be sustained. In practice, this system dominates for roughly up to a couple of minutes, and by around three minutes the aerobic system generally takes over for longer activity. That’s why three minutes is the best fit among the options.

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