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Physiological reactions during acute adaptation to reduced gravity.

E B Shulzhenko1, R A Tigranyan, V E Panfilov

  • 1Institute of Biomedical Problems, Moscow, USSR.

Life Sciences and Space Research
|January 1, 1980
PubMed
Summary

This 7-day water immersion study in healthy volunteers shows physiological adaptation. Key findings reveal coupled hypophyseal-adrenal and renal functions during reduced gravity simulation.

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Area of Science:

  • Physiology
  • Human Adaptation
  • Cardiovascular Research

Background:

  • Understanding human physiological responses to simulated reduced gravity is crucial for space exploration.
  • Water immersion provides a well-established method for simulating reduced gravity effects on the human body.

Purpose of the Study:

  • To investigate the physiological, fluid-electrolyte, and biochemical changes during a 7-day water immersion protocol.
  • To elucidate the regulatory mechanisms involved in acute adaptation to simulated reduced gravity.

Main Methods:

  • Healthy volunteers underwent a 7-day dry water immersion protocol.
  • Cardiovascular, fluid-electrolyte, and biochemical parameters were continuously monitored.
  • Phasic physiological changes during immersion were analyzed.

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Main Results:

  • Physiological parameters exhibited distinct phasic changes throughout the 7-day immersion.
  • An acute adaptation phase was observed within the first three days, followed by relative normalization of some parameters.
  • The hypophyseal-adrenal system and renal function demonstrated close coupling during adaptation.

Conclusions:

  • The hypophyseal-adrenal system and renal function are key regulators of cardiovascular adaptation and fluid-electrolyte balance during simulated reduced gravity.
  • The human body undergoes significant, yet adaptable, physiological changes in response to short-term reduced gravity.
  • Findings contribute to understanding human resilience and regulatory mechanisms in altered gravitational environments.