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Related Experiment Videos

Mental performance during submaximal exercise in 13 and 17% oxygen.

D R Knight1, C L Schlichting, C S Fulco

  • 1Naval Submarine Medical Research Laboratory, Naval Submarine Base, Groton, CT 06349-5900.

Undersea Biomedical Research
|May 1, 1990
PubMed
Summary

Reduced oxygen levels in submarines may affect mental function. This study found that 17% oxygen did not impair psychomotor performance during exercise at normal pressure, suggesting cognitive functions remain intact in such conditions.

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Area of Science:

  • Environmental Physiology
  • Human Performance
  • Aerospace Medicine

Background:

  • Submarine environments expose crews to variable oxygen (O2) and carbon dioxide (CO2) levels.
  • Reduced O2 may potentially impair cognitive and psychomotor functions, especially during physical exertion.

Purpose of the Study:

  • To assess the impact of reduced O2 on psychomotor performance in exercising men.
  • To determine if specific O2 concentrations affect cognitive tasks under simulated submarine conditions.

Main Methods:

  • Psychomotor performance (timed arithmetic) was measured in exercising men exposed to 21%, 17%, and 13% O2.
  • Exposure occurred in a hypobaric chamber at Hours 26 and 57, with varying pressures.
  • Subjects exercised at 35% and 65% of predicted VO2max, with arterial oxygen saturation (SaO2) monitored.

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Main Results:

  • At Hour 26, reduced O2 (17% and 13%) caused hypoxia during exercise, affecting timed arithmetic performance.
  • At Hour 57, math scores were influenced by work rate but not the O2 exposure condition.
  • Post-hoc analysis indicated 17% O2 did not impair the timed arithmetic task during submaximal exercise at normobaric pressures.

Conclusions:

  • Submarine crews' psychomotor performance may be affected by reduced O2 levels, particularly during exertion.
  • Normobaric 17% O2 exposure does not appear to impair timed arithmetic performance during submaximal exercise.
  • Further research is needed to understand the full impact of varying O2 and CO2 on cognitive function in confined environments.