A swimmer performs a 200 metre freestyle race.
Explain how TWO different energy systems contribute to fatigue during this event. (4 marks)
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Sample Answer
ATP-PCr System
- In the first 10-15 seconds, the ATP-PCr system rapidly depletes its phosphagen stores, reducing the power output available for the explosive start and initial sprint phase, forcing reliance on less efficient energy systems for immediate power generation.
Glycolytic System
- The glycolytic system dominates throughout most of the race, causing progressive lactic acid accumulation that decreases muscle contraction efficiency and interferes with enzyme function, leading to the characteristic “burning” sensation and pace decline.
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Sample Answer
ATP-PCr System
- In the first 10-15 seconds, the ATP-PCr system rapidly depletes its phosphagen stores, reducing the power output available for the explosive start and initial sprint phase, forcing reliance on less efficient energy systems for immediate power generation.
Glycolytic System
- The glycolytic system dominates throughout most of the race, causing progressive lactic acid accumulation that decreases muscle contraction efficiency and interferes with enzyme function, leading to the characteristic “burning” sensation and pace decline.