infradian rhythm

infradian rhythm
a biological rhythm with a periodicity longer than 28 hours or with a frequency less than one cycle per 24 hour, e.g. lunar and seasonal rhythms

Dictionary of ichthyology. 2009.

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  • Infradian rhythm — An infradian rhythm is a rhythm with a period greater than the period of a circadian rhythm, i.e. with a frequency smaller than one cycle in 28 hours. [Brown, Frederick M. Graeber, R. Curtis, eds.. The Rhythmic Aspects of Behavior. Hillsdale, NJ …   Wikipedia

  • infradian rhythm — the regular recurrence in cycles of more than 24 hours from one stated point to another, such as certain biologic activities that occur at such intervals, regardless of conditions of illumination …   Medical dictionary

  • Zeitgeber — (from German for time giver , synchronizer) is any exogenous (external) cue that entrains the endogenous (internal) time keeping system of organisms. The strongest zeitgeber, for both plants and animals, is light. Other, non photic, zeitgebers… …   Wikipedia

  • Ultradian — rhythms are recurrent periods or cycles repeated throughout a 24 hour circadian day. (In contrast, infradian rhythms have periods longer than a day, for example the human menstrual cycle.) The descriptive term ultradian is used in sleep research… …   Wikipedia

  • Biorhythm — A biorhythm (from Greek βιορυθμός biorhuthmos ) is a hypothetical cycle in physiological, emotional, or intellectual well being or prowess. Bio pertains to life and rhythm pertains to the flow with regular movement. Biorhythms theory has no more… …   Wikipedia

  • Circadian — Refers to events occurring within a 24 hour period, in the span of a full (24 hour) day, as in a circadian rhythm. The word “circadian” is a 20th century invention. It was coined in 1959 from the Latin “circa” (around) + “diem” (a day). However,… …   Medical dictionary

  • ultradian — Relating to biologic variations or rhythms occurring in cycles more frequent than every 24 hours. Cf.:circadian, infradian. [ultra + L. dies, day] * * * ul·tra·di·an əl trād ē ən adj being, characterized by, or occurring in periods or cycles (as… …   Medical dictionary

  • List of psychology topics — This page aims to list all topics related to psychology. This is so that those interested in the subject can monitor changes to the pages by clicking on Related changes in the sidebar. It is also to see the gaps in Wikipedia s coverage of the… …   Wikipedia

  • Chronobiology — Overview of human circadian biological clock with some physiological parameters …   Wikipedia

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