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Body mass change during altered gravity: spaceflight, centrifugation, and return to 1 G
C E Wade1, J S Harper, N G Daunton
1Life Sciences Division, NASA Ames Research Center, Moffett Field, CA 94035-1000, USA. cwade@mail.arc.nasa.gov
Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|September 7, 2001
Summary
Altered gravity affects rat growth. Microgravity did not change mass gain, but hypergravity caused acute mass loss that persisted. Rats adapted to 1G after gravity transitions.
Area of Science:
- Space biology
- Gravitational physiology
Background:
- Understanding how gravity affects biological systems is crucial for space exploration.
- Growth and mass regulation are fundamental physiological processes influenced by environmental factors.
Purpose of the Study:
- To investigate the impact of microgravity and hypergravity on immature rat growth.
- To examine mass changes during transitions between different gravity levels.
Main Methods:
- Rats were exposed to microgravity (spaceflight) and hypergravity (2G) for extended periods.
- Body mass gain was monitored and compared between experimental groups and 1G controls.
- Mass changes during transitions from hypergravity to normal gravity were assessed.
Main Results:
- Spaceflight (microgravity) did not significantly alter rat body mass gain.
- Hypergravity (2G) exposure led to an initial acute body mass loss that persisted throughout the study.
- Rats transitioning from hypergravity to 1G showed an initial mass increase and continued to gain mass, though differences from controls remained on day 16.
Conclusions:
- Gravity significantly impacts mammalian growth, with hypergravity inducing persistent mass reduction.
- While acute mass loss occurs during gravity transitions, rats demonstrate adaptive capacity to regain mass.
- Findings highlight the complex relationship between gravity, growth, and physiological adaptation.