circadian rhythm

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Related to Circadian cycle: Circadian clock

circadian rhythm:

see rhythm, biologicalrhythm, biological,
or biorhythm,
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 ?
Peroxiredoxins, in contrast, are well-known antioxidant enzymes that undergo circadian cycles in redox state that are deeply conserved across the tree of life and are sometimes accompanied by circadian cycles in the protein abundance (Edgar et al., 2012).
(b) Relative mRNA expression levels of Per2, Rev-erba, AVP, Bmall, and VIP throughout a circadian cycle under long (left) photoperiod or short (right) photoperiod.
Again, samples were then collected over a longer time course to further investigate these significant differences in gene expression and gain a finer temporal resolution over a 1.5 circadian cycle, the clock gene expressions were analysed every four hours 16 h to 52 h postrhythmic mechanical stimulation (Figure 5(a)).
"We think that if you have a 'weak' circadian cycle, you can't get enough signal to affect physiology," says Zhao.
The molecular circadian cycle is initiated when the transcriptional activators Clock and Bmal1 (Bunger et al.
Nearly 5,000 genes in the mouse liver follow a circadian cycle that corresponds to mealtimes, Panda and his colleagues reported in the Dec.
Despite sufficient flexibility and numerous adaptation mechanisms to regularly occurring events, some alterations of the circadian cycle go beyond the limits of one's system ability to compensate for (Fig.).
Scheer and colleagues, symptoms of metabolic syndrome resulted when participants ate and slept at the wrong times--that is, out of alignment with their habitual circadian cycle. Over a 10-day experimental study, participants ate and slept at all phases of the circadian cycle.
They adhered, for instance, to a circadian cycle. That is, each one would likely write letters at a preferred time of day.
He said: "Sleeping during the day can throw off your circadian cycle and impact future sleep.
Under the project, entitled "A Spectrally Dynamic Berth Light for Active Circadian Cycle Management," Energy Focus will further develop solid-state lighting technology for a naval berth light that will effectively reset a sailor's body clock for environments where the natural circadian rhythm is frequently disrupted.
In an attempt to get a better understanding of the effects that shift work has on people, their health, their performance, and their families, it is necessary to look at the history of shift work and the circadian cycle. Throughout the remainder of this paper, the term "shift work" means working hours that do not fall within the standard definition of a workday, 8:00 am to 5:00 pm.