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Related Experiment Videos

Decreased human circadian pacemaker influence after 100 days in space: a case study.

T H Monk1, K S Kennedy, L R Rose

  • 1Clinical Neuroscience Research Center, Department of Psychiatry, University of Pittsburgh Medical Center, Pittsburgh, PA, USA. monkth@msx.upmc.edu

Psychosomatic Medicine
|November 24, 2001
PubMed
Summary

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Astronauts on long space missions may experience weakened internal body clocks after 3 months, potentially disrupting sleep. This study monitored an astronaut

Area of Science:

  • Space medicine
  • Chronobiology
  • Human physiology in space

Background:

  • Understanding astronaut health during prolonged spaceflight is crucial for mission success.
  • Circadian rhythms, essential for regulating sleep-wake cycles, may be affected by microgravity and altered light-dark cycles in space.

Observation:

  • A healthy male astronaut's circadian rhythms and sleep patterns were monitored for nearly 5 months aboard Space Station Mir.
  • Oral temperature and subjective alertness were recorded multiple times daily, alongside sleep diaries and performance tests.

Findings:

  • The astronaut's internal body clock (circadian pacemaker) functioned well for approximately 90 days in space.
  • After 90 days, the influence of the circadian pacemaker weakened, leading to disruptions in oral temperature, alertness rhythms, and sleep.
Keywords:
NASA Discipline Regulatory PhysiologyNon-NASA Center

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Implications:

  • Space missions exceeding 3 months may pose a risk of diminished circadian pacemaker function in astronauts.
  • This could lead to significant sleep disturbances and impact astronaut performance and well-being during extended missions.