What happens to the resting heart rate as a result of regular endurance exercise?

Question

BlackTom AI · Accepted Answer

Regular endurance training increases stroke volume and parasympathetic (vagal) tone, so resting heart rate decreases—commonly by 10 to 20 beats per minute.

1. Relevant knowledge points and concepts
- Cardiac output (CO) = heart rate (HR) × stroke volume (SV). At rest, CO must meet metabolic needs.
- Endurance training causes cardiac adaptations: increased SV (larger chamber size, more efficient contraction) and increased vagal tone/reduced sympathetic input.
- With higher SV, the heart can pump the same CO with fewer beats per minute, lowering resting HR. Trained athletes commonly show resting bradycardia (40–60 bpm).

2. Step-by-step reasoning
- Assume a typical untrained resting HR of 70 bpm and SV of 70 mL → CO = 70 × 70 = 4900 mL/min.
- Endurance training might increase SV to ~100 mL (example +43%).
- To maintain the same CO: HR = CO / SV = 4900 / 100 = 49 bpm.
- Reduction in HR = 70 − 49 = 21 bpm (about 20 bpm). This demonstrates how increased SV allows a 10–20 bpm drop in resting HR.

3. Intermediate calculation shown above
- Baseline: HR0 = 70 bpm, SV0 = 70 mL → CO = 4900 mL/min.
- After training: SV1 = 100 mL → HR1 = 4900 / 100 = 49 bpm → ΔHR ≈ 21 bpm.

4. Why the correct answer is correct
- Physiological evidence and population studies routinely report resting HR decreases of about 10–20 bpm with regular endurance training due to the mechanisms above. This matches the option stating a 10–20 bpm lower resting HR.

5. Why other choices are incorrect
- "It is 10 to 20 beats per minute higher.": contradicted by physiological adaptations; endurance training does not raise resting HR.
- "It is up to 10 beats per minute higher.": also incorrect—resting HR does not increase with endurance training.
- "It is up to 10 beats per minute lower.": understates the typical effect; many trained individuals show reductions larger than 10 bpm, often reaching 10–20 bpm.

6. Conclusion
The correct choice is: It is 10 to 20 beats per minute lower. This matches the physiological mechanisms and typical observed reductions in resting heart rate with regular endurance exercise.

What happens to the resting heart rate as a result of regular endurance exercise?Single choice

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