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Decrement in postural control during mild hypobaric hypoxia.

W D Fraser, D E Eastman, M A Paul

    Aviation, Space, and Environmental Medicine
    |August 1, 1987
    PubMed
    Summary
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    Mild hypoxia impairs postural control, increasing sway at lower altitudes. However, postural stability recovers at higher altitudes, likely due to compensatory mechanisms. This study investigates altitude effects on balance.

    Area of Science:

    • Physiology
    • Aerospace Medicine
    • Human Performance

    Background:

    • Postural control is crucial for maintaining stability.
    • Hypoxia, or low oxygen levels, can affect physiological functions.
    • The impact of mild hypoxia on postural control requires further investigation.

    Purpose of the Study:

    • To examine the effects of mild hypoxia on postural control.
    • To assess postural sway at simulated altitudes.
    • To investigate the relationship between altitude, oxygen saturation, and postural stability.

    Main Methods:

    • 39 naive subjects were exposed to simulated altitudes (1,521m to 3,658m).
    • Postural sway was measured using a Kistler force platform.
    • Arterial oxygen saturation (SaO2) and end-tidal oxygen partial pressure (PetO2) were monitored.

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    Main Results:

    • Postural sway increased significantly at altitudes up to 3,048m.
    • No significant change in sway was observed at 3,658m compared to ground level.
    • Arterial oxygen saturation and end-tidal oxygen partial pressure decreased with increasing altitude.

    Conclusions:

    • Postural control mechanisms are sensitive to acute mild hypoxia.
    • Compensatory mechanisms may explain the recovery of postural stability at higher altitudes.
    • Mild hypoxia affects physiological markers like SaO2 and PetO2.