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HMS, BM EQ-Bank 340 MC

Which of the following statements correctly describes the immediate response of cardiac output during the initial phase of a moderate intensity training session?

  1. Cardiac output decreases to maintain blood pressure at resting level
  2. Cardiac output remains constant while heart rate and stroke volume adjust
  3. Cardiac output increases due to an increase in both heart rate and stroke volume
  4. Cardiac output increases solely due to increased stroke volume
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Consider Option C:  Cardiac output increases due to an increase in both heart rate and stroke volume

  • During the initial phase of moderate intensity training, cardiac output increases due to an increase in both heart rate and stroke volume to meet the increased oxygen demand of working muscles.

Other Options:

  • A is incorrect: Cardiac output increases, not decreases during exercise
  • B is incorrect: Cardiac output changes, not remains constant
  • D is incorrect: Both heart rate and stroke volume increase, not stroke volume alone