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Systemic and forearm vascular resistance changes after upright bicycle exercise in man
A J Coats1, J Conway, J E Isea
1Department of Cardiovascular Medicine, John Radcliffe Hospital, Oxford.
The Journal of Physiology
|June 1, 1989
Summary
Maximal upright bicycle exercise causes a brief increase in blood pressure and cardiac function. Post-exercise, systemic vasodilation and reduced vascular resistance persist for at least an hour, affecting non-exercising limbs.
Area of Science:
- Cardiovascular Physiology
- Exercise Physiology
Background:
- Understanding the cardiovascular response to exercise is crucial for assessing physical health.
- The immediate and sustained effects of maximal exercise on systemic hemodynamics and vascular function require further elucidation.
Purpose of the Study:
- To investigate the effects of maximal upright bicycle exercise on blood pressure, cardiac function, and forearm blood flow.
- To determine the duration and extent of systemic vasodilation and its impact on non-exercising vascular beds post-exercise.
Main Methods:
- A cross-over study design was employed with thirteen healthy volunteers.
- Measurements included blood pressure, cardiac function (aortic blood velocity, acceleration), and forearm blood flow.
- Exercise was compared against a control day without exercise.
Main Results:
- Exercise induced a transient increase in systolic blood pressure and cardiac function markers.
- Systemic vasodilation, characterized by reduced diastolic blood pressure and systemic vascular resistance, persisted for at least 60 minutes post-exercise.
- Forearm blood flow significantly increased, indicating vasodilation in a non-exercising vascular bed.
Conclusions:
- Maximal upright bicycle exercise elicits both acute cardiac stimulation and prolonged systemic vasodilation.
- A systemic vasodilatory influence extends beyond exercising muscles, impacting remote vascular beds for up to an hour post-exercise.