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Neuromuscular adaptation to microgravity environment.

Y Ohira1

  • 1Department of Physiology and Biomechanics, Research Center for Sports Training and Education, National Institute of Fitness and Sports, Kanoya, 891-2393, Japan. ohira@nifs-k.ac.jp

The Japanese Journal of Physiology
|October 4, 2000
PubMed
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Skeletal muscles adapt to microgravity by changing fiber type and function. This article explores neural and muscular mechanisms behind these adaptations, focusing on muscle atrophy and fast-twitch fiber shifts.

Area of Science:

  • Space biology
  • Neuroscience
  • Muscle physiology

Background:

  • Skeletal muscles exhibit significant adaptability to environmental changes.
  • Microgravity exposure causes muscle atrophy and a shift towards fast-twitch fibers, particularly in antigravity muscles.

Purpose of the Study:

  • To discuss neuromuscular responses and adaptation mechanisms in microgravity.
  • To review neural and muscular adaptations to reduced gravity environments.

Main Methods:

  • Review of morphological, metabolic, and contractile properties of muscles.
  • Analysis of muscle fiber phenotype changes.
  • Examination of electromyogram patterns, muscle tension, postural stability, locomotion, and motoneuron activity.

Main Results:

Related Experiment Videos

  • Muscle atrophy and a shift towards fast-twitch fibers are key adaptations to microgravity.
  • Neuromuscular responses are altered, impacting muscle function and control.

Conclusions:

  • Understanding these adaptations is crucial for mitigating negative effects of microgravity.
  • Further research into neural and muscular mechanisms can inform countermeasures for spaceflight and terrestrial applications.