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Rat growth during chronic centrifugation.

G C Pitts1, J Oyama

  • 1Department of Physiology, School of Medicine, University of Virginia, Charlottesville, Virginia, USA.

Life Sciences and Space Research
|January 1, 1979
PubMed
Summary

Chronic centrifugation at 4.15 g reduced mature body mass in rats. However, the rate of growth remained similar, and recovery occurred upon return to normal gravity, with skin mass being the only component significantly altered by centrifugation.

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Area of Science:

  • Physiology
  • Gravitational Biology
  • Comparative Physiology

Background:

  • Understanding the effects of altered gravity on mammalian physiology is crucial for space exploration.
  • Previous studies have indicated significant physiological changes under hypergravity conditions.

Purpose of the Study:

  • To investigate the long-term effects of chronic hypergravity on body composition and growth in female rats.
  • To determine if altered growth rates or adaptive changes occur in specific tissues under sustained high gravity.

Main Methods:

  • Female weanling rats were subjected to chronic centrifugation at 4.15 g.
  • Body composition was analyzed in samples of 6-10 rats at multiple time points during centrifugation (0, 28, 63, 105, 179, 308 days) and after recovery (57 days post-centrifugation).
  • Analysis included measurements of total body mass and masses of various tissues (muscle, bone, skin, CNS, heart, kidneys), body water, and body fat.

Main Results:

  • The hypergravity group exhibited a significantly lower mature body mass (251 g) compared to controls (318 g).
  • The rate of approach to mature body mass was comparable between the centrifuged and control groups.
  • Complete recovery of body mass was observed upon return to 1 g if initiated on day 60.
  • While masses of multiple components changed, only skin mass showed a significant increase relative to the fat-free compartment, indicating it was the primary tissue responding to hypergravity.

Conclusions:

  • Chronic hypergravity exposure leads to a reduced mature body mass in rats but does not alter the fundamental growth rate.
  • The observed changes in tissue masses are largely proportional to overall growth, with skin being a notable exception, suggesting a specific adaptive response.
  • Reversibility of effects is possible, highlighting the adaptive capacity of mammalian systems to gravitational changes.

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