circadian rhythm


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Related to circadian rhythm: melatonin, Circadian rhythm sleep disorder

circadian rhythm:

see rhythm, biologicalrhythm, biological,
cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the environment.
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circadian rhythm

[sər′kād·ē·ən ′rith·əm]
(physiology)
A self-sustained cycle of physiological changes that occurs over an approximately 24-hour cycle, generally synchronized to light-dark cycles in an organism's environment.
References in periodicals archive ?
Sweeney tested the ability of different wavelengths of light--corresponding to different colors--to shift the circadian rhythm in the photosynthetic marine dinoflagellate Gonyaulax polyedra.
The human circadian rhythm has been shown to impact metabolism, which when disturbed can contribute to obesity and glucose intolerance.
The circadian rhythm is generated in the suprachiasmatic nuclei (SCN) located in the hypothalamus in mammals.
shifted"), an experience that is known to disrupt an organism's innate circadian rhythm.
So while the rooster's crow can be prompted by external factors, the innate circadian rhythm seems to be a fundamental driver of crowing.
It hasn't been clear whether disrupting these clocks could also contribute to disease, says Satchidananda Panda, a circadian rhythm researcher at the Salk Institute for Biological Studies in La Jolla, Calif.
By respecting the body's circadian rhythm, the Programmable SkyCeiling can be viewed as a healing tool, a statement said.
Surprisingly, the earthworm's circadian rhythm of light-withdrawal virtually disappeared under these conditions (Bennett, 1974).
Apparently, it's all down to your circadian rhythm, which is your natural wake and sleep pattern.
Melatonin taken in the evening can shift a person's circadian rhythm earlier while melatonin in the morning can shift it later, he said.
Under normal conditions our body maintains what is called a circadian rhythm (from the Latin circa dies, meaning "approximately one day").

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