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HMS, BM EQ-Bank 308 MC

The table shows physiological data collected from an athlete during a training session.

Which statement best explains the relationship between these physiological responses during training?

  1. Heart rate and stroke volume decrease at the same rate during exercise
  2. Cardiac output increases mainly due to increases in stroke volume
  3. Heart rate continues to increase throughout exercise while stroke volume plateaus
  4. Cardiac output decreases as heart rate increases during training
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Consider Option C: Heart rate continues to increase throughout exercise while stroke volume plateaus

  • The data shows heart rate continually increasing from 120 to 160 bpm while stroke volume increases initially but plateaus at 110 mL.

Other Options:

  • A is incorrect: The data shows heart rate increasing and stroke volume increasing then plateauing, not decreasing.
  • B is incorrect: Cardiac output increases due to both heart rate and stroke volume initially, but primarily due to heart rate in later stages.
  • D is incorrect: Cardiac output increases, not decreases, as heart rate increases.