biorhythm

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bi·o·rhythm

(bī'ō-rith-m),
A biologically inherent cyclic variation or recurrence of an event or state, such as the sleep cycle, circadian rhythms, or periodic diseases.
[bio- + G. rhythmos, rhythm]

biorhythm

(bī′ō-rĭth′əm)
n.
An innate, cyclical biological process or function.

bi′o·rhyth′mic (-rĭth′mĭk) adj.

biorhythm

biorhythm

Alternative medicine
A hypothetical biologic rhythm, which is said to be set at birth.
The biorhythm theory was first proposed by H Swoboda and W Fleiss, a contemporary and colleague of Sigmund Freud; proponents of the biorhythm theory believe there are three distinct cycles: a physical cycle of 23 days—which corresponds to co-ordination, immunity, self-confidence, and strength; an emotional cycle of 28 days; and an intellectual cycle of 33 days, all of which are defined by a sine wave; “critical periods” are believed to exist as an individual crosses the middle of a cycle, either from a high to a low, or vice versa.

Physiology
Cyclical variations in physiologic and biochemical function, level of activity and emotional state. Circadian biorhythms have a cycle of about 24 hrs; ultradian rhythms are < 1 day; infradian rhythms are greater than one day and may be up to weeks or months.

bi·o·rhythm

(bī'ō-ridh-ĕm)
A biologically inherent cyclic variation or recurrence of an event or state, such as the sleep cycle, circadian rhythms, or periodic diseases.
[bio- + G. rhythmos, rhythm]

biorhythm

inherent, cyclical, consistent and predictable variation within a biological variable about its mean, over a given period (see circadian)

biorhythm

see biological rhythm.