Circadian, infradian and ultradian rhythms

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Cricadian rhythms are biological cycles lasting around 24 hours facilitated by time checks and regular events such as meal times, and controlled by an endogenous pacemaker working as a 'body clock' Sleep-wake cycle

  • Siffre (1972) sixth months in a cave with no times, settling into a sleep-wake cycle of 25-30 hours
  • Aschoff and Weber (1965) found that participants in a bunker with no natural light settled into a sleep-wake cycle of 25-27 hours, implying that endogenous pacemakers exert a strong influence on circadian rythms.

Infradian rythms are biological cycles lasting more then 24 hours controlled by the hypothalamus…


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