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Hypobaric hypoxia impairs spatial memory in an elevation-dependent fashion

B Shukitt-Hale1, M J Stillman, D I Welch

  • 1Military Performance and Neuroscience Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760-5007.

Behavioral and Neural Biology
|November 1, 1994
PubMed
Summary

High altitude conditions (hypobaric hypoxia) impair spatial memory in rats. Performance deficits were observed at simulated altitudes of 5950 m and 6400 m, affecting both reference and working memory.

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Area of Science:

  • Neuroscience
  • Altitude Physiology
  • Cognitive Psychology

Background:

  • Hypobaric hypoxia, simulating high altitude, causes cognitive deficits in humans.
  • Few studies have investigated cognitive changes in animals under hypobaric hypoxia.
  • Spatial memory is crucial for navigation and survival.

Purpose of the Study:

  • To examine the effects of varying hypobaric hypoxia levels on rat spatial memory.
  • To correlate cognitive performance with simulated altitude exposure.
  • To understand animal models of high-altitude cognitive impairment.

Main Methods:

  • Male Fischer 344 rats were used.
  • Spatial memory was assessed using the Morris water maze (learning set version).
  • Rats were exposed to simulated altitudes (sea level, 5500 m, 5950 m, 6400 m) for 2 and 6 hours.

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Main Results:

  • Exposure to 5950 m or 6400 m significantly impaired spatial memory (reference and working) in an elevation-dependent manner.
  • Deficits were evident in latency, distance, and speed measures.
  • Post-exposure testing revealed persistent reference memory deficits and working memory speed impairment.

Conclusions:

  • Hypobaric hypoxia causes significant, dose-dependent spatial memory impairments in rats.
  • Findings align with human studies on high-altitude cognitive performance.
  • Potential mechanisms include alterations in hippocampal cholinergic function.