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Certified Strength And Conditioning Specialist (CSCS) Exercise Science Practice Test

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Which energy system dominates energy supply for very short, high-intensity efforts of about 5-15 seconds?
Correct Answer:
Phosphagen energy system
Explanation:
For very short, high-intensity efforts, the muscles rely on the phosphagen energy system because it can produce ATP extremely quickly from stored ATP and phosphocreatine without needing oxygen. This rapid ATP regeneration supports maximal effort right at the start, which is crucial for efforts in the 5–15 second window. The capacity of this system is limited, so its dominance is strongest in that brief burst before other systems take over. Lipid oxidation is too slow for high-intensity bursts, and oxidative phosphorylation depends on oxygen and lags in onset, making them unsuitable for powering such short, intense efforts.

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