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Changes in human adrenal and gonadal function onboard Spacelab.

F Strollo1, G Strollo, M More

  • 1INRCA, Italian National Research Centers on Ageing, Endocrine Unit, Rome, Italy.

Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|July 1, 1997
PubMed
Summary

Astronauts experienced lower testosterone levels during space missions due to chronic stress. However, their cortisol rhythm remained stable, indicating stress adaptation in male astronauts during short flights.

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Area of Science:

  • Space medicine
  • Endocrinology
  • Human physiology

Background:

  • Spaceflight induces chronic stress, potentially altering hormone levels.
  • Key hormones affected include ACTH, cortisol, LH, and testosterone.
  • Disruption of circadian rhythms can impact mission results.

Purpose of the Study:

  • To assess if male astronauts exhibit decreased plasma testicular androgens during short-duration flights.
  • To determine if cortisol's biological rhythm is maintained under spaceflight stress.

Main Methods:

  • Measurement of plasma testicular androgens and cortisol levels in male astronauts.
  • Monitoring of hormone levels relative to baseline and circadian rhythm protocols.
  • Analysis during short-duration space missions.

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Main Results:

  • Plasma testicular androgens were found to be lower than baseline levels.
  • The biological rhythm of cortisol was preserved in astronauts.
  • No mention of ACTH or LH changes in the provided abstract.

Conclusions:

  • Spaceflight-induced stress may lead to reduced testosterone in male astronauts.
  • Cortisol secretion patterns appear resilient to short-term spaceflight demands.
  • Further research is needed to fully understand hormonal adaptations to spaceflight.