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Human tolerance to acceleration after exposure to weightlessness.
1Institute of Medical and Biological Problems, Moscow, USSR.
Life Sciences and Space Research
|January 1, 1976
Summary
Human tolerance to Gx accelerations decreases after simulated weightlessness due to deconditioned antigravity mechanisms. The average tolerance limit post-exposure is 11.6 +/- 1.6g, with no further decrease after 7 days of simulated weightlessness.
Area of Science:
- Space Medicine
- Human Physiology
- Aerospace Engineering
Background:
- Weightlessness leads to deconditioning of antigravity mechanisms.
- This deconditioning impacts human tolerance to decelerations.
- Hypodynamic and hydrostatic factors are key in altered G-tolerance.
Purpose of the Study:
- To assess human tolerance to Gx accelerations after simulated weightlessness.
- To evaluate the impact of simulated weightlessness duration on G-tolerance.
- To determine the risk associated with G-force exposure post-spaceflight.
Main Methods:
- Laboratory experiments simulating weightlessness for 3 to 100 days.
- Testing human tolerance to +Gx accelerations of varying durations.
- Analyzing changes in G-tolerance and identifying countermeasures.
Main Results:
- Human tolerance to +Gx accelerations decreased by an average of -2.0g.
- Extending simulated weightlessness from 7 to 100 days did not further reduce +Gx tolerance.
- The tolerance limit to +Gx accelerations ranged from 9.5 to 13.0g (average 11.6 +/- 1.6g).
Conclusions:
- Simulated weightlessness significantly reduces human tolerance to Gx accelerations.
- The established tolerance limits provide a basis for assessing real-world risks during spaceflight.
- Laboratory findings are supported by data from actual astronaut re-entry experiences.