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Structural and metabolic characteristics of rhesus monkey m. soleus after spaceflight

B S Shenkman1, I N Belozerova, P Lee

  • 1RF SRC--Institute of Biomedical Problems, Moscow, Russia.

Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|September 7, 2001
PubMed

Insights

Microgravity and reduced movement caused soleus muscle fibers in rhesus monkeys to shrink. Both slow- and fast-twitch fibers, along with protein and capillaries, decreased in size in space-flown animals.

Area of Science:

  • Muscle physiology
  • Space biology
  • Animal models

Background:

  • Muscle atrophy is a significant concern during spaceflight.
  • Understanding the specific effects on different muscle fiber types is crucial.

Purpose of the Study:

  • To investigate the impact of microgravity and reduced motor activity on the soleus muscle fibers of rhesus monkeys.
  • To quantify changes in fiber size, protein content, and capillary supply.

Main Methods:

  • Histological analysis of soleus muscle cross-sections from rhesus monkeys.
  • Comparison between animals subjected to spaceflight (microgravity and reduced activity) and control groups.

Main Results:

  • Significant reduction in the size of both slow-twitch and fast-twitch soleus muscle fibers in flight animals.
  • Decreased total protein content per fiber in flight animals.
  • Reduced number of capillaries per muscle fiber in flight animals.

Conclusions:

  • Microgravity and diminished motor activity induce significant atrophy in soleus muscle fibers.
  • These conditions lead to a reduction in muscle protein and vascular supply.
  • Findings highlight the detrimental effects of spaceflight on skeletal muscle structure and function.
Keywords:
NASA Experiment Number B11-03B

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