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infradian rhythm

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biological rhythm

Overview page. Subjects: Medicine and Health.

Any periodic, more-or-less regular fluctuation or cycle in a biological system or process that is not wholly under the control of environmental cues but is controlled centrally by a...

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biorhythm

Overview page. Subjects: Science and Mathematics — Sports and Exercise Medicine.

A roughly periodic change in the behaviour or physiology of an organism that is generated and maintained by a biological clock. Well-known examples are the annual and circadian rhythms...

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chronobiology

Overview page. Subjects: Psychology — Medicine and Health.

The branch of biology concerned with biological rhythms. See biological clock, biological rhythm. See also alpha wave, basic rest-activity cycle, beta wave, circadian rhythm, circannual...

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circadian rhythm

Overview page. Subjects: Biological Sciences — Medicine and Health.

Any 24-hour periodicity in the behaviour or physiology of animals or plants. Examples are the sleep/activity cycle in many animals and the growth movements of plants. Circadian rhythms are...

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circannual rhythm

Overview page. Subjects: Psychology.

Any biological rhythm involving a biological or psychological process that occurs or fluctuates at intervals of approximately one year, even in controlled environments from which seasonal...

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ultradian

Overview page. Subjects: Science and Mathematics.

adj. denoting a biological rhythm or cycle that occurs more frequently than once in 24 hours. Compare circadian; nyctohemeral.

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