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Centrally-generated commands and cardiovascular control in man

D I McCloskey

    Clinical and Experimental Hypertension
    |January 1, 1981
    PubMed
    Summary

    Central nervous system activity influences cardiovascular control, impacting heart rate and blood pressure even during paralysis. Voluntary motor commands during exercise also affect cardiovascular function, independent of feedback.

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    Area of Science:

    • Neuroscience
    • Cardiovascular Physiology

    Background:

    • Central neural activity significantly influences cardiovascular control.
    • Respiratory neuron activity can impose rhythmicity on heart rate and vasomotion, even during paralysis.
    • Cardiovascular reflexes are modulated by central neural inputs.

    Purpose of the Study:

    • To elucidate the role of centrally-generated voluntary motor commands in cardiovascular regulation during muscular exercise.
    • To understand how central neural signals contribute to heart rate and blood pressure changes.
    • To investigate the interplay between central command and reflex mechanisms in cardiovascular control.

    Main Methods:

    • The study discusses established physiological principles and observations.
    • It references scenarios involving induced muscular weakness (e.g., curarization, fatigue) to isolate central command effects.
    • The analysis focuses on the cardiovascular responses to increased motor command signals.

    Main Results:

    • Centrally-generated voluntary motor commands contribute to increased heart rate and blood pressure during exercise.
    • These command-related stimuli exert coarse adjustments on cardiovascular function.
    • The effects of central command occur independently of direct cardiovascular feedback.

    Conclusions:

    • Central neural outflow plays a crucial role in cardiovascular control beyond reflex mechanisms.
    • Voluntary motor commands represent a significant non-feedback pathway for cardiovascular regulation.
    • Understanding central command is key to comprehending the overall control of heart rate and blood pressure.

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