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HMS, BM EQ-Bank 191

A swimmer performs a 200 m freestyle race.

Explain how TWO different energy systems contribute to fatigue during this event.   (4 marks)

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Sample Answer

Any TWO of the following

  • 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.
  • The glycolytic system dominates through the middle section of the race, causing lactic acid accumulation in the working muscles which decreases the efficiency of muscle contractions.
  • The aerobic system becomes increasingly important in the final 50 m, but oxygen delivery may become limited, contributing to a reduction in ATP production and subsequent power output.
Show Worked Solution

Sample Answer

Any TWO of the following

  • 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.
  • The glycolytic system dominates through the middle section of the race, causing lactic acid accumulation in the working muscles which decreases the efficiency of muscle contractions.
  • The aerobic system becomes increasingly important in the final 50 m, but oxygen delivery may become limited, contributing to a reduction in ATP production and subsequent power output.