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Hemodynamic responses during prolonged sitting.

E Shvartz, J G Gaume, R T White

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |June 1, 1983
    PubMed
    Summary
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    Prolonged sitting causes calf blood pooling and increased peripheral resistance. Hemodynamic responses stabilize after one hour of sitting, regardless of prior posture.

    Area of Science:

    • Physiology
    • Cardiovascular Research

    Background:

    • Understanding hemodynamic responses during prolonged sitting is crucial.
    • Previous posture may influence circulatory adjustments to sitting.

    Purpose of the Study:

    • To investigate the effects of prolonged sitting and prior posture on hemodynamic responses.
    • To determine the time course of circulatory adaptation to sitting.

    Main Methods:

    • Hemodynamic responses were measured using impedance plethysmography in young men.
    • Two groups experienced different sitting durations and preceding postures (recumbency, standing, walking).

    Main Results:

    • Prolonged sitting increased calf venous pooling and decreased calf blood flow.
    • Diastolic and mean arterial pressures increased with prolonged sitting.

    Related Experiment Videos

  • Hemodynamic responses became similar between groups after one hour of sitting.

    • Conclusions:

    • One hour of sitting is necessary for stable hemodynamic assessment, irrespective of prior posture.
    • Calf blood pooling is a primary effect of prolonged sitting, compensated by increased peripheral resistance.