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Related Experiment Videos

Performance and mood-state parameters during 30-day 6 degrees head-down bed rest with exercise training

C W DeRoshia1, J E Greenleaf

  • 1Life Science Division, NASA, Ames Research Center, Moffett Field, CA 94035-1000.

Aviation, Space, and Environmental Medicine
|June 1, 1993
PubMed
Summary
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Prolonged bed rest did not impair performance or mood in healthy men. Exercise training did not alter these outcomes, though one group showed mood changes possibly due to overtraining.

Area of Science:

  • Exercise Physiology
  • Human Performance
  • Psychological Health

Background:

  • Prolonged bed rest (BR) can induce physiological deconditioning.
  • The impact of different exercise-training regimens on mood and performance during BR requires further investigation.

Purpose of the Study:

  • To determine if performance and mood impairments occur in bed-rested subjects.
  • To assess if different exercise-training regimens (isotonic and isokinetic) modify or prevent these impairments.

Main Methods:

  • Eighteen healthy men were divided into three groups: no exercise (NOE), isotonic exercise (ITE), and isokinetic exercise (IKE).
  • Subjects underwent 30 days of absolute bed rest (BR) with daily assessments of performance, mood, and sleep.
  • A 15-minute battery of 10 performance tests and 8 mood/2 sleep scales were used.
Keywords:
NASA Center ARCNASA Discipline Number 18-10NASA Discipline Regulatory PhysiologyNASA Program Space Physiology and Countermeasures

Related Experiment Videos

Main Results:

  • Performance proficiency increased in 7 of 10 tests for all groups during BR, with no significant differences between groups.
  • The ITE group showed a decline in activation mood dimensions (motivation, concentration) and improvement in sleep/tension scales during BR.
  • No consistent significant deleterious changes in performance or mood were observed across groups.

Conclusions:

  • Mood and performance did not deteriorate in response to prolonged bed rest.
  • Exercise training did not alter overall mood and performance during bed rest.
  • The observed mood changes in the ITE group may indicate overtraining or excessive workload.