What is a long-term effect of regular cardiorespiratory exercise in young adults?

Question

BlackTom AI · Accepted Answer

Improved electrical stability in the heart results from increased vagal tone and favorable cardiac remodeling produced by regular cardiorespiratory exercise.

1. Relevant knowledge points and concepts
- Cardiorespiratory (aerobic) training increases parasympathetic (vagal) activity and decreases sympathetic drive at rest.
- Aerobic conditioning raises stroke volume and can produce physiologic (eccentric) left ventricular remodeling that enhances efficient conduction and repolarization.
- Improved autonomic balance and myocardial oxygen delivery reduce arrhythmia susceptibility and promote electrical stability.
- Opposite choices (increased platelet stickiness, increased body fat, increased resting heart rate) contradict known chronic effects of aerobic training.

2. Step-by-step reasoning
- Regular aerobic exercise → repeated cardiovascular demand.
- Adaptation 1: increased stroke volume and cardiac output during exercise; resting cardiac output maintained with lower heart rate.
- Adaptation 2: increased resting parasympathetic tone and reduced resting sympathetic tone.
- Effect on electrical properties: greater vagal tone slows sinus node discharge and stabilizes refractory periods; reduced sympathetic tone lowers ectopic automaticity and the chance of triggered arrhythmias.
- Net result: improved electrical stability and lower resting heart rate.

3. Intermediate conceptual steps (no numeric calculation required)
- Baseline: sympathetic/parasympathetic balance determines heart rate and arrhythmia risk.
- After training: parasympathetic ↑, sympathetic ↓ → resting HR ↓ and reduced arrhythmogenic potential.

4. Why the correct answer is correct
Improved electrical stability directly follows from the autonomic and structural cardiac adaptations to aerobic training. Increased vagal influence and healthier myocardial perfusion make electrical conduction more regular and reduce arrhythmia risk.

5. Why other options are incorrect
- Increased platelet stickiness: aerobic exercise typically reduces thrombotic risk and improves platelet function, not increases stickiness.
- Increased body fat: regular cardiorespiratory exercise generally reduces body fat or helps maintain healthy composition.
- Increased resting heart rate: the opposite occurs; resting HR usually decreases with conditioning.

6. Conclusion
Therefore, the long-term effect in young adults is improved electrical stability in the heart, which matches the provided correct answer.

What is a long-term effect of regular cardiorespiratory exercise in young adults?单项选择题

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