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Microcirculation and high altitude edema.

G Ueda1, M Takeoka, A Sakai

  • 1Department of Environ Physiology, Shinshu University School of Medicine, Matsumoto, Japan.

International Journal of Sports Medicine
|October 1, 1992
PubMed
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Physiological responses to cold stress and high altitude involve complex interactions between nervous and respiro-circulatory systems. Research suggests a unified acute mountain sickness (AMS) condition rather than distinct types.

Area of Science:

  • Physiology
  • Environmental Medicine
  • Altitude Sickness Research

Background:

  • Cellular functions are regulated by information processing (nervous) and energy distribution (respiro-circulatory) systems.
  • Defensive reactions, such as vasoreactions to cold stress, are critical physiological responses.
  • Altitude-induced physiological stress, including hypobaric hypoxia, impacts organ systems.

Purpose of the Study:

  • To analyze the time course of cold vasoreaction in rabbit ear blood vessels.
  • To investigate the effects of hypobaric hypoxia on lung lymph volume in sheep.
  • To correlate nervous system and respiro-circulatory symptoms in humans at simulated high altitudes and to clarify the nature of acute mountain sickness (AMS).

Main Methods:

  • Observation of cold vasoreaction time course in rabbit ear blood vessels.

Related Experiment Videos

  • Exposure of sheep to hypobaric hypoxia (6600 m) and measurement of lung lymph volume.
  • Application of Sampson's method to analyze simulated-altitude symptoms in human subjects at 3700 m.

    • Main Results:

    • Rhythmical changes and trends were identified in cold vasoreaction.
    • Hypobaric hypoxia increased lung lymph volume in sheep, with most recovering post-exposure.
    • Nervous system symptoms correlated with respiro-circulatory symptoms in humans at simulated altitude, suggesting a common AMS condition.

    Conclusions:

    • The distinction between cerebral (AMS-C) and respiratory (AMS-R) types of acute mountain sickness is not clear-cut.
    • A generalized form of acute mountain sickness (AMS-general) likely exists.
    • The study highlights the systemic physiological impact of environmental stressors like cold and altitude.