... found that participants could not adapt to less than a 23-hour cycle. Infradian rhythms occur less than once every 24 hours, for instance, hibernation in squirrels and the human menstrual cycle. Research into this rhythm has concentrated mainly on the human menstrual cycle, such as Reinberg's (1967) study of a woman who spent three months in a cave with dim lighting levels. Her sleep/wake cycle lengthened and her menstrual cycle shortened. It took a further year for her menstrual cycle to return to normal. Another infradian rhythm study was carried out by McClintock (1971) who pointed out how a woman's menstrual cycle can be entrained by the cycle of other women with whom she spends a great deal of time, such as in nunneries or boarding school. After some time the women's cycles become synchronised. It was also found that women who work with men have shorter menstrual cycles. B)Assess the impact ...

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