Describe and evaluate research into infradian rhythms (8.
An ultradian rhythm is a biological rhythm that occurs with a frequency of less than 24 hours. Sleep is composed of several repetitive cycles of about 90 minutes in length. The sleep cycle is composed on two types of sleep: REM (Rapid Eye Movement) and non-REM sleep.
In chronobiology, an ultradian rhythm is a recurrent period or cycle repeated throughout a 24-hour day. In contrast, circadian rhythms complete one cycle daily, while infradian rhythms such as the human menstrual cycle have periods longer than a day.
Menstrual cycles- report of woman- 3 months in cave- no natural light- shortened menstrual cycle to 25.7 days. Shows IR's are influenced by EZ's e.g light cues.
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Medical definition of infradian: being, characterized by, or occurring in periods or cycles (as of biological activity) of more than 24 hours.
Infradian rhythms are defined as an endogenous rhythm pattern that has a cycle duration longer than circadian rhythms, that is more than 24 hours per cycle. Due to the longer time frame for each cycle the frequency of occurrence in these cycles is lower than that of the circadian rhythms.
Nevertheless, the recent finding that the period of the ultradian rhythm of pituitary LH release is lengthened by about 20% in the homozygous tau mutant hamster (i.e., about the same amount as the period of the circadian activity rhythm is shortened) indicates that common gene products may regulate both circadian and ultradian rhythmical processes in mammals (Wayne et al., 1992).