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HMS, BM EQ-Bank 179 MC

During a 400 m sprint race, an athlete's performance is most dependent on which combination of energy systems?

  1. ATP-PCr and Aerobic
  2. Lactic Acid and ATP-PCr
  3. Aerobic and Lactic Acid
  4. Equal contribution from all three systems
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\(B\)

Show Worked Solution

Consider Option B:  Lactic Acid and ATP-PCr

  • A 400 m sprint typically takes 45-60 seconds requiring both immediate energy from ATP-PCr for the explosive start and lactic acid system for maintaining the high-intensity effort throughout the race.

Other Options:

  • A is incorrect: Aerobic system isn’t dominant in this duration
  • C is incorrect: Aerobic system isn’t significantly involved at this intensity/duration
  • D is incorrect: All systems don’t contribute equally in this event

\(\Rightarrow B\)