circadian rhythm

(redirected from Circadian cycles)
Also found in: Dictionary, Thesaurus, Medical.

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.
..... Click the link for more information.
.

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 ?
To adjust the effect of circadian cycle in each rat, we subtracted the hourly baseline responses from the hourly averaged response to filtered air and concentrated particles to obtain the crude effect at each hour since exposure for each rat.
This difference in responses can be represented by a phase-response curve (see figure 1 for a schematic illustration of a circadian cycle as well as a phase-response curve).
Our patented method of carefully timed bright light can shift an individual's circadian cycle two to three hours in one day, and up to eight to ten hours in two days.
Just one exposure to light shifted many aspects of her circadian cycle -- a finding that surprised scientists, who believed the human biological clock was not very sensitive to light but instead relied on social cues.