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Related Experiment Videos

Circadian rhythms in a long-term duration space flight.

A M Alpatov1

  • 1Institute of Biomedical Problems, Moscow, USSR.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|January 1, 1992
PubMed
Summary

Maintaining cosmonaut health requires aligning work-rest schedules with human circadian rhythms (CR). Spaceflight can destabilize CR, increasing desynchronosis risk. A flexible, non-24-hour schedule may be necessary.

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Area of Science:

  • Space biology
  • Chronobiology
  • Human physiology

Background:

  • Maintaining cosmonaut health and performance is crucial for space missions.
  • Work-rest schedules must align with human circadian rhythms (CR).
  • Understanding CR in spaceflight is essential for astronaut well-being.

Purpose of the Study:

  • To investigate the impact of spaceflight on human circadian rhythms.
  • To assess the stability of circadian phase in microgravity.
  • To identify potential countermeasures for circadian desynchronosis during long-duration spaceflight.

Main Methods:

  • Review of investigations on CR in mammals and insects during spaceflight.
  • Analysis of potential gravity-dependent parameters affecting circadian period.
  • Exploration of non-24-hour day lengths and biofeedback for work-rest scheduling.

Main Results:

  • Circadian phase in spaceflight is less stable, likely due to altered entrainment range and internal period changes.
  • Circadian period may be influenced by gravity, suggesting different day-length requirements in weightlessness.
  • A higher risk of desynchronosis is predicted for long-duration space missions.

Conclusions:

  • Spaceflight poses a risk to circadian rhythm stability, potentially impacting cosmonaut health.
  • A flexible work-rest schedule, possibly using a non-24-hour day, is recommended.
  • Biofeedback mechanisms to track body temperature CR could aid in adapting schedules to weightlessness.

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