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{{wikt|infradian}}Infradian rhythm is, in chronobiology a rhythm with a duration longer than that of a circadian rhythm, i.e. with a frequency less than one cycle in 28 hours,[1] Examples include the menstrual cycle, breeding and tidal or seasonal rhythms. Ultradian rhythms by contrast, have periods shorter than the period of a circadian rhythm. A number of infradian rhythms are known to be caused by hormone stimulation or exogenous factors for example seasonal depression, linked to the lowering of light levels during winter.[2]See alsoReferences1. ^Brown, Frederick M. & Graeber, R. Curtis, eds. The Rhythmic Aspects of Behavior. Hillsdale, NJ: Lawrence Erlbaum Associates. 1982, (p.462).
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{{biology-stub}} 2 : Biology|Chronobiology |