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Central command influences cardiorespiratory response to dynamic exercise in humans with unilateral weakness
J A Innes1, S C De Cort, P J Evans
1Department of Medicine, Charing Cross and Westminster Medical School, London.
The Journal of Physiology
|March 1, 1992
Summary
Increased central neural drive to weak leg exercise elevates ventilation and cardiovascular responses. This study demonstrates the significant impact of neural signals on physiological adaptations during physical exertion.
Area of Science:
- Exercise Physiology
- Neuroscience
- Cardiovascular Regulation
Background:
- Exercise elicits changes in ventilation and cardiovascular function.
- These changes may be influenced by neural signals from exercising muscles to central control areas.
Purpose of the Study:
- To investigate the role of central neural drive in exercise-induced physiological responses.
- To compare ventilatory and cardiovascular responses during exercise with a normal versus a weakened leg.
Main Methods:
- Subjects performed steady-state exercise at two intensity levels using either their normal or weakened leg.
- Ventilatory (tidal volume) and cardiovascular (heart rate, blood pressure, stroke volume, cardiac output) variables were measured.
Main Results:
- Ventilation was significantly higher during weak leg exercise, primarily due to increased tidal volume.
- Heart rate, systolic, and diastolic blood pressures were elevated during weak leg exercise.
- Stroke volume and cardiac output did not differ between normal and weak leg exercise.
Conclusions:
- Findings support the hypothesis that central neural drive influences ventilation, heart rate, and blood pressure during exercise.
- Greater neural drive to a weakened limb leads to amplified autonomic responses.