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Sleep physiology at high altitude.

M Reite, D Jackson, R L Cahoon

    Electroencephalography and Clinical Neurophysiology
    |May 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    High altitude sleep disturbances in young men were characterized by reduced deep sleep and increased arousals. Despite subjective complaints, objective sleep quality was relatively preserved, suggesting arousals may explain the discrepancy.

    Area of Science:

    • High-altitude physiology
    • Sleep medicine
    • Cardiorespiratory function

    Background:

    • High altitude exposure (4301 m) significantly impacts physiological functions.
    • Sleep disturbances are commonly reported by individuals at high altitudes.
    • Understanding sleep alterations is crucial for acclimatization and performance.

    Purpose of the Study:

    • To objectively assess sleep patterns and cardiorespiratory responses during high-altitude exposure.
    • To investigate the relationship between subjective sleep complaints and objective sleep measures.
    • To explore the role of periodic respiration and heart rate changes in high-altitude sleep.

    Main Methods:

    • Polysomnography (EEG, EKG, respiration) recorded over 6 nights (2 sea level, 4 high altitude) in 6 young men.

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  • Objective sleep stages, arousals, wake time, periodic respiration, and heart rate were analyzed.
  • Effects of oxygen administration and acclimatization over 12 days were observed.

    • Main Results:

    • High altitude sleep showed decreased Stage 3/4 sleep, increased arousals, and more wake time, contrasting with preserved total sleep time.
    • Periodic respiration was frequent at altitude, responsive to oxygen, and unrelated to arousals or REM sleep.
    • Elevated heart rate during sleep at altitude gradually normalized over 12 days.

    Conclusions:

    • Increased arousals, not reduced total sleep time, likely explain subjective sleep complaints at high altitude.
    • Hypoxemia and/or acute altitude-induced alkalosis may contribute to objective sleep disruption.
    • Further research is needed to differentiate the causative factors of high-altitude sleep disturbance.