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Related Experiment Videos

Altitude and hypoxia as phase shift inducers

I E Ashkenazi, J Ribak, D M Avgar

    Aviation, Space, and Environmental Medicine
    |April 1, 1982
    PubMed
    Summary
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    Simulated flight exposure to reduced barometric pressure and hypoxia significantly shifted circadian rhythms in physiological and performance parameters for young adults. These rhythms showed synchronized phase shifts for four days before tending to return to their original patterns.

    Area of Science:

    • Human physiology
    • Chronobiology
    • Aerospace medicine

    Background:

    • Circadian rhythms influence daily physiological and performance fluctuations.
    • Environmental stressors can disrupt biological rhythms.
    • Understanding stressor effects on circadian rhythms is crucial for health and performance.

    Purpose of the Study:

    • To assess the impact of simulated high-altitude flight (reduced barometric pressure and hypoxia) on circadian rhythms.
    • To investigate the temporal dynamics of circadian rhythm shifts following stressor exposure.
    • To examine the recovery pattern of physiological and performance parameters.

    Main Methods:

    • Three young subjects were exposed to a simulated flight in a low-pressure chamber (25,000 ft).
    • Physiological (oral temperature) and performance (peak expiratory flow, grip strength, cognitive tests) parameters were measured before and after exposure.

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  • Circadian rhythm acrophases (peak times) were analyzed for shifts post-exposure.

    • Main Results:

    • Significant shifts in circadian rhythm acrophases were observed for multiple parameters after the simulated flight.
    • The phase shifts exhibited a synchronized pattern across subjects for four days.
    • A tendency for circadian rhythms to resume original phase positions was noted on the fourth day.

    Conclusions:

    • Combined stressors of reduced barometric pressure and hypoxia significantly disrupt human circadian rhythms.
    • Post-stressor circadian rhythm disruption can persist for several days in a synchronized manner.
    • The findings suggest a potential for rhythm normalization, warranting further investigation into recovery timelines.