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Problem: thirst, drinking behavior, and involuntary dehydration.

J E Greenleaf1

  • 1Laboratory for Human Gravitational Physiology, NASA, Ames Research Center, Moffett Field, CA 94035-1000.

Medicine and Science in Sports and Exercise
|June 1, 1992
PubMed
Summary
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Involuntary dehydration, a delay in restoring body water, occurs under various stresses. Its complex mechanism involves physiological factors and psychological influences on drinking behavior.

Area of Science:

  • Physiology
  • Human Biology
  • Environmental Medicine

Background:

  • Involuntary dehydration, a delay in rehydrating the body, is a known phenomenon.
  • Its precise physiological mechanisms remain poorly understood.
  • It is observed in humans under diverse stressors like exercise, heat, cold, altitude, and microgravity.

Purpose of the Study:

  • To explore the physiological mechanisms underlying involuntary dehydration.
  • To identify factors contributing to the delayed restoration of body water deficit.

Main Methods:

  • Review of existing literature on involuntary dehydration and fluid balance.
  • Analysis of contributing factors including physiological, gastrointestinal, and central nervous system influences.
  • Consideration of psychological and social aspects of fluid intake.
Keywords:
NASA Center ARCNASA Discipline Regulatory Physiology

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Main Results:

  • Involuntary dehydration is proportional to the total stress imposed on the body.
  • Key controlling factors include social influences on consumption, gastrointestinal fluid absorption capacity, cellular hydration status (osmotic-vasopressin interaction), and hypovolemic-angiotensin II stimuli.
  • Drinking behavior can occur without apparent physiological stimulus, indicating a psychological component.

Conclusions:

  • Involuntary dehydration is a multifactorial phenomenon.
  • Understanding its mechanisms requires considering physiological, gastrointestinal, central nervous system, and psychological elements.
  • The psychological component of drinking behavior is crucial for a comprehensive understanding.