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Related Experiment Videos

The primate circadian timekeeping system in a hyperdynamic environment.

C A Fuller1

  • 1Department of Animal Physiology, University of California, Davis 95616, USA.

The Physiologist
|January 1, 1984
PubMed
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Hyperdynamic fields (+G) affect primate circadian rhythms, altering feeding and drinking patterns. The circadian timekeeping system remains functional but shows altered regulation under simulated high-G conditions.

Area of Science:

  • Primates
  • Circadian Biology
  • Space Physiology

Background:

  • The circadian timekeeping system regulates physiological processes.
  • Understanding its function under altered gravity is crucial for space exploration.
  • Squirrel monkeys serve as a model for primate physiology.

Purpose of the Study:

  • To investigate the impact of hyperdynamic fields (+G) on the circadian timekeeping system of squirrel monkeys.
  • To assess how feeding and drinking rhythms are affected by simulated high-G environments.
  • To determine if circadian rhythms persist and how they are regulated under hyperdynamic conditions.

Main Methods:

  • Squirrel monkeys were exposed to sequential hyperdynamic fields (1.0, 1.5, 2.0 G) on a centrifuge.
  • Animals experienced both light-dark cycles and constant light conditions.
Keywords:
NASA Discipline Number 40-30NASA Discipline Regulatory PhysiologyNASA Program Space BiologyNon-NASA Center

Related Experiment Videos

  • Feeding and drinking patterns were electronically monitored every 30 minutes.

    • Main Results:

    • Prominent circadian rhythms in feeding and drinking were observed across all tested G-levels.
    • Rhythms synchronized to the light-dark cycle at 1 G, but a phase delay occurred in the +G environment.
    • Constant light exposure at 2.0 G resulted in a longer free-running period compared to 1 G.

    Conclusions:

    • The primate circadian timekeeping system is functional within hyperdynamic environments.
    • Hyperdynamic conditions can alter the entrainment and free-running periods of circadian rhythms.
    • Specific components of the circadian system may be regulated at different homeostatic levels under simulated high-G.