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Related Experiment Videos

Cognitive performance during short acclimation to severe hypoxia

D Leifflen1, D Poquin, G Savourey

  • 1Unité de Psychologie, Centre de Recherches du Service de Santé des Armées La Tronche France.

Aviation, Space, and Environmental Medicine
|December 31, 1997
PubMed
Summary
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Short acclimation to severe hypoxia (simulated high altitude) appears to trigger adaptive processes. Cognitive function, specifically choice reaction time, remained largely unimpaired during acute exposure up to 7000m.

Area of Science:

  • Altitude Physiology
  • Cognitive Neuroscience
  • Human Performance

Background:

  • High altitude exposure necessitates acclimatization to mitigate severe hypoxia effects.
  • Short acclimation protocols using intermittent severe hypoxia in hypobaric chambers induce physiological pre-adaptation.
  • Cognitive effects of such acclimation protocols are not well understood.

Purpose of the Study:

  • To investigate the cognitive repercussions of a short acclimation protocol involving intermittent exposure to severe hypoxia.
  • To assess the impact of simulated high altitudes on choice reaction time and cognitive performance.

Main Methods:

  • Four mountaineers underwent a 5-day acclimation protocol.
  • Daily measurements of arterial oxygen saturation (SaO2) were taken.

Related Experiment Videos

  • A choice reaction time task (Manikin test) was performed twice daily at ground level and simulated high altitudes (5000m to 7000m).

    • Main Results:

    • Arterial oxygen saturation decreased initially, then stabilized around 72-73% at high altitudes.
    • Error rates in the reaction time task remained low throughout the protocol.
    • Response times showed no significant changes relative to ground level up to 7000m.

    Conclusions:

    • A short acclimation protocol with intermittent severe hypoxia exposure can trigger adaptive processes.
    • Cognitive function, assessed by a choice reaction time task, was not significantly impaired during acute severe hypoxia up to 7000m.
    • This suggests potential for effective pre-adaptation without major cognitive deficits.