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Bradycardia induced by negative acceleration.

J A Kennealy, J S Kirkland, R E Sneider

    Aviation, Space, and Environmental Medicine
    |May 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

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    Negative acceleration in a human centrifuge can cause significant cardiac rhythm changes, including sinus bradycardia and sinus arrest. These vagally induced effects were well tolerated by the volunteers.

    Area of Science:

    • Aerospace Medicine
    • Cardiovascular Physiology
    • Human Factors in Aviation

    Background:

    • High-performance aircraft can generate significant G-forces, impacting pilot physiology.
    • Understanding the cardiac effects of G-force exposure is crucial for flight safety.

    Purpose of the Study:

    • To evaluate the cardiac effects of negative acceleration using a standard lap belt.
    • To investigate the incidence and nature of cardiac rhythm changes during negative G exposure.

    Main Methods:

    • Four volunteers were exposed to negative acceleration in a human centrifuge.
    • Cardiac rhythm was monitored during and after exposure to -2 G and +1 G.

    Main Results:

    • Three subjects experienced sinus bradycardia.

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  • One subject developed sinus arrest with a junctional rhythm at -2 G.
  • Sinus rhythm and normal P-R intervals recovered post-exposure, with transient prolonged P-R intervals.

    • Conclusions:

    • Negative acceleration maneuvers can induce significant, vagally mediated cardiac rhythm alterations.
    • These cardiac events, including sinus arrest, are remarkably well tolerated.
    • Findings are relevant to the physiological limits of pilots in high-performance aircraft.