Describe the relationship between heart rate, stroke volume and cardiac output during aerobic training. (4 marks)
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Sample Answer
- Cardiac output increases during aerobic training due to increases in both heart rate and stroke volume.
- Heart rate increases proportionally to exercise intensity, often reaching 120-180 beats per minute depending on fitness and intensity.
- Stroke volume increases initially but plateaus at moderate intensity exercise.
- The relationship can be expressed as Cardiac Output = Heart Rate × Stroke Volume, showing how both components contribute to increased blood flow.
- As exercise continues, heart rate becomes the primary contributor to cardiac output increases. Stroke volume remains relatively stable after its initial rise.
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Sample Answer
- Cardiac output increases during aerobic training due to increases in both heart rate and stroke volume.
- Heart rate increases proportionally to exercise intensity, often reaching 120-180 beats per minute depending on fitness and intensity.
- Stroke volume increases initially but plateaus at moderate intensity exercise.
- The relationship can be expressed as Cardiac Output = Heart Rate × Stroke Volume, showing how both components contribute to increased blood flow.
- As exercise continues, heart rate becomes the primary contributor to cardiac output increases. Stroke volume remains relatively stable after its initial rise.