Ultradian rhythm

An ultradian rhythm is a recurrent period or cycle repeated throughout a 24-hour circadian day. In contrast, infradian rhythms, such as the human menstrual cycle, have periods longer than a day. The Oxford English Dictionary's definition of Ultradian specifies that it refers to cycles with a period shorter than a day but longer than an hour.

单词	Ultradian rhythm
释义	Ultradian rhythm 英语百科 Ultradian rhythm An ultradian rhythm is a recurrent period or cycle repeated throughout a 24-hour circadian day. In contrast, infradian rhythms, such as the human menstrual cycle, have periods longer than a day. The Oxford English Dictionary's definition of Ultradian specifies that it refers to cycles with a period shorter than a day but longer than an hour.
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