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Exercise-training protocols for astronauts in microgravity.

J E Greenleaf1, R Bulbulian, E M Bernauer

  • 1National Aeronautics and Space Administration Ames Research Center, Moffett Field, California, 94035.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 1, 1989
PubMed
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Two exercise protocols are proposed for astronauts in microgravity to maintain physiological functions or allow a 10% reduction in aerobic power. Further research is needed for effective bone loss prevention strategies.

Area of Science:

  • Space Medicine
  • Exercise Physiology

Background:

  • Astronauts face physiological deconditioning in microgravity, including reduced aerobic power, muscular strength, endurance, and potential bone loss.
  • Exercise training is a key countermeasure, but optimal protocols for spaceflight remain undetermined.

Purpose of the Study:

  • To propose two distinct exercise protocols for astronauts in microgravity.
  • To address the unresolved question of optimal exercise prescription for space missions.

Main Methods:

  • Review of physical working requirements for intra- and extravehicular activities.
  • Analysis of findings from bed-rest studies on exercise countermeasures.

Main Results:

  • Proposal 1: Maintain astronaut physiological functions at 100% of ground-based levels during microgravity.
Keywords:
NASA Center ARCNASA Discipline Number 18-10NASA Discipline Regulatory PhysiologyNASA Program Biomedical Research

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  • Proposal 2: Allow a 10% reduction in maximal aerobic power compared to ground-based levels during flight.

    • Conclusions:

    • Current data is insufficient to prescribe in-flight prevention of calcium (bone) loss.
    • Proposed protocols aim to stimulate further research for optimized astronaut health and well-being in space.