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Related Experiment Videos

Baroreflex responsiveness is maintained during isometric exercise in humans.

T J Ebert

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |August 1, 1986
    PubMed
    Summary
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    Isometric handgrip exercise alters arterial baroreflex control. Central neural influences may modify baroreflex function during exercise anticipation and execution.

    Area of Science:

    • Cardiovascular Physiology
    • Autonomic Nervous System Regulation

    Background:

    • Isometric handgrip exercise increases heart rate and arterial pressure.
    • This suggests potential alterations in arterial baroreflex control mechanisms.

    Purpose of the Study:

    • To investigate the influence of isometric handgrip exercise on human carotid baroreflex control.
    • To determine if central neural influences affect baroreflex function during exercise anticipation.

    Main Methods:

    • Nine healthy young men underwent incremental neck suction and pressure to modulate carotid sinus transmural pressure.
    • Carotid stimuli were applied during supine rest, anticipatory rest before exercise, and during isometric handgrip (20% MVC).
    • Stimulus-response curves were derived relating carotid sinus transmural pressure to changes in R-R interval and mean arterial pressure.

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    Main Results:

    • Carotid stimuli elicited smaller R-R interval prolongation and mean arterial pressure decline during anticipation compared to control.
    • Baroreflex function curves were shifted rightward during handgrip, indicating altered control.
    • Baroreflex sensitivity, indicated by regression slopes, remained unchanged during handgrip.

    Conclusions:

    • Isometric handgrip exercise specifically influences carotid baroreflex control of arterial pressure and heart period.
    • Central neural influences may play a role in altering baroreflex function during exercise anticipation and execution.