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The G-tolerance after pharmacological hypohydration.

V B Noskov1, V Yu Lukyanuk

  • 1Russian Federation State Scientific Centre-Institute of Biomedical Problems RAS, Moscow, Russia.

Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|October 20, 2005
PubMed
Summary

Pharmacological hypohydration using diuretics did not significantly impact Gx tolerance in healthy males. However, it slightly reduced Gz tolerance, suggesting safe use before spaceflight to mitigate discomfort and physiological effects.

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Area of Science:

  • Aerospace Medicine
  • Human Physiology
  • Pharmacology

Background:

  • Spaceflight initiation involves physiological stressors, including G-force exposure.
  • Maintaining crew comfort and performance during pre-launch is critical.
  • Pharmacological methods for managing physiological states in astronauts are under investigation.

Purpose of the Study:

  • To evaluate the impact of pharmacological hypohydration on Gx and Gz tolerance in healthy males.
  • To assess the safety and efficacy of diuretics for pre-flight physiological preparation.
  • To determine if hypohydration affects tolerance to acceleration profiles relevant to spaceflight.

Main Methods:

  • 18 healthy males (25-45 years) underwent Gx (ballistic reentry profile) and Gz (to physiological limit) tolerance tests.

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  • Moderate hypohydration was induced using Furosemide or a Furosemide/Hypothiazide/Triamterene combination.
  • Physiological parameters including body mass, plasma volume, and electrolyte excretion were monitored.

    • Main Results:

    • Hypohydration (approx. 2L water loss, 2% body mass reduction, 13.5% plasma volume decrease) did not substantially impair +Gx tolerance.
    • No pathological signs limiting +Gx tolerance up to 8.3g were observed.
    • +Gz tolerance was reduced by 0.6g following diuretic-induced hypohydration.

    Conclusions:

    • Diuretics can be safely employed pre-flight to mitigate negative physiological effects of early spaceflight.
    • Pre-launch diuretic use may enhance cosmonaut comfort by reducing pre-flight urination.
    • Pharmacological hypohydration offers a potential strategy for optimizing astronaut readiness for space missions.