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Hypoxia and circadian patterns.

Jacopo P Mortola1

  • 1Department of Physiology, McGill University, Basic Sciences Building, Room 1121, 3655 Sir William Osler Promenade, Montreal, Quebec H3G 1Y6, Canada. jacopo.mortola@mcgill.ca

Respiratory Physiology & Neurobiology
|March 21, 2007
PubMed
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Prolonged hypoxia disrupts daily biological rhythms, primarily by reducing the amplitude of circadian oscillations in body temperature and metabolism. This disruption may explain common symptoms associated with low oxygen levels.

Area of Science:

  • Chronobiology
  • Physiology
  • Environmental Medicine

Background:

  • Mammalian biological timekeeping is regulated by a hierarchical system, with the suprachiasmatic nuclei (SCN) acting as the master clock.
  • Circadian rhythms in body temperature and metabolic rate are critical functions closely controlled by the SCN.

Purpose of the Study:

  • To investigate the effects of prolonged hypoxia on circadian rhythms in mammals.
  • To understand how hypoxia-induced alterations in core biological rhythms may contribute to symptoms experienced during sustained low oxygen exposure.

Main Methods:

  • Analysis of data from animal (primarily rat) and human studies examining physiological responses to hypoxia.
  • Assessment of changes in the amplitude and period of circadian oscillations in body temperature and metabolic rate.

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Main Results:

  • Prolonged hypoxia commonly decreases or abolishes the amplitude of daily circadian oscillations.
  • Hypoxia causes minimal and transient perturbations to the period of these rhythms.
  • Evidence suggests other bodily functions linked to core rhythms are also perturbed by hypoxia.

Conclusions:

  • Hypoxia significantly impacts circadian rhythms, particularly affecting the amplitude of oscillations in key physiological variables.
  • Alterations in circadian rhythms due to hypoxia are hypothesized to contribute to symptoms like sleep fragmentation, malaise, and appetite loss.
  • Further research is needed to fully elucidate the mechanisms and extent of hypoxia's effects on biological timekeeping.