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Central control of cardiovascular adjustments to exercise
Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1985
Summary
Physically conditioned men learned to voluntarily control heart rate (HR) during exercise using biofeedback. This HR control reduced exercise tachycardia and decreased oxygen consumption without compromising muscle function.
Area of Science:
- Exercise Physiology
- Cardiovascular Regulation
- Biofeedback
Background:
- Voluntary control over physiological responses during exercise is not well understood.
- Understanding mechanisms of heart rate (HR) regulation during physical exertion is crucial for optimizing training and performance.
Purpose of the Study:
- To investigate the capacity for voluntary heart rate (HR) control during moderate-intensity exercise.
- To examine the effects of HR biofeedback on exercise tachycardia and associated physiological responses.
Main Methods:
- 10 healthy, physically conditioned men performed moderate exercise on a bicycle ergometer.
- Experimental group received real-time HR feedback and instructions to slow HR.
- Control group exercised without feedback or specific instructions.
Main Results:
- Experimental subjects showed a 22% lower increase in HR compared to controls.
- Subsequent feedback training in control subjects also led to a significant HR decrease (9%).
- HR attenuation correlated with reduced oxygen consumption and pulmonary ventilation, and decreased myocardial oxygen demand.
Conclusions:
- Physically conditioned individuals can learn to voluntarily attenuate exercise-induced tachycardia using biofeedback.
- This HR control is associated with improved cardiovascular efficiency and reduced cardiac workload.
- Biofeedback training can modulate autonomic cardiovascular responses during exercise without negatively impacting metabolic demands on working muscles.