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Updated: Oct 4, 2026

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Human adaptation to simulated gravitational fields
E B Shulzhenko1, I F Vil-Vilyams, V E Panfilov
1Institute of Biomedical Problems, Moscow, USSR.
Abstract:
We present the resuIts of manned studies in which test subjects were exposed to simulated zero g (water immersion or head-down tilt at -6 degrees) and head-to-feet acceleration. The findings give evidence that humans have different individual tolerances to an acceleration of +3 Gz after exposure to zero g, whether simulated by immersion or by head-down tilt. The paper discusses the role of functional relationship between water balance and cardiac output in the establishment of adaptive reactions to simulated zero g.
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