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Effect of exercise on cerebral circulation.

M Globus, E Melamed, A Keren

    Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
    |September 1, 1983
    PubMed
    Summary
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    Supine physical exercise did not significantly alter cerebral blood flow (CBF) in healthy individuals. Despite increased cardiac output and blood pressure, cerebrovascular resistance rose, indicating complex autoregulation during exercise.

    Area of Science:

    • Physiology
    • Neurology
    • Cardiovascular Science

    Background:

    • Cerebral blood flow (CBF) regulation is crucial for brain function.
    • Understanding how CBF responds to physical exertion is vital for assessing neurological and cardiovascular health.

    Purpose of the Study:

    • To investigate the effects of supine physical exercise on cerebral blood flow (CBF) in healthy subjects.
    • To correlate CBF changes with physiological parameters like PCO2, heart rate, blood pressure, cardiac output, and right atrial pressure.

    Main Methods:

    • Utilized the 133Xe inhalation technique to measure CBF in 30 normal subjects during supine exercise.
    • Employed Swan-Ganz catheterization in 10 subjects to obtain detailed hemodynamic measurements.

    Main Results:

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    • No significant changes in CBF were observed during supine physical exercise.
    • Cardiac output, blood pressure, and right atrial pressure significantly increased, while PCO2 mildly decreased.
    • Cerebrovascular resistance increased by 38%, contrasting with a 33% decrease in peripheral vascular resistance.

    Conclusions:

    • Cerebral autoregulation mechanisms effectively maintain stable CBF during supine exercise despite systemic hemodynamic changes.
    • The observed increase in cerebrovascular resistance suggests a protective response or altered vascular tone in the brain during physical exertion.