010-111 · Question #207
Cardiovascular adaptations to chronic endurance training include a(n)________ at a given fixed submaximal exercise intensity.
The correct answer is C. increase in stroke volume and a decrease in heart rate. Chronic endurance training causes the heart to become more efficient, so at any fixed submaximal intensity the same cardiac output is achieved with a higher stroke volume and a lower heart rate.
Question
Cardiovascular adaptations to chronic endurance training include a(n)________ at a given fixed submaximal exercise intensity.
Options
- Adecrease in stroke volume and heart rate
- Bincrease in stroke volume and heart rate
- Cincrease in stroke volume and a decrease in heart rate
- Ddecrease in stroke volume and increase in heart rate
How the community answered
(62 responses)- A13% (8)
- B3% (2)
- C76% (47)
- D8% (5)
Why each option
Chronic endurance training causes the heart to become more efficient, so at any fixed submaximal intensity the same cardiac output is achieved with a higher stroke volume and a lower heart rate.
Stroke volume increases with endurance training; a decrease in stroke volume would indicate detraining or cardiac dysfunction.
Heart rate at submaximal exercise decreases after training (not increases), reflecting improved cardiac efficiency.
Endurance training induces eccentric cardiac hypertrophy, increasing left ventricular end-diastolic volume and therefore stroke volume via the Frank-Starling mechanism. Because cardiac output (heart rate x stroke volume) required at a given submaximal load does not change, the rise in stroke volume is offset by a reduction in heart rate - a hallmark of the trained cardiovascular system.
Stroke volume increases (not decreases) after chronic endurance training due to ventricular remodeling and enhanced venous return.
Concept tested: Chronic endurance training cardiovascular adaptations
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