circadian


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circadian

 [ser″kah-de´an, ser-ka´de-an]
denoting a period of one day, or repeating every day; see circadian rhythm.
circadian rhythm sleep disorder a sleep disorder of the dyssomnia group, consisting of a lack of synchrony between the schedule of sleeping and waking required by the external environment and that of the person's own circadian rhythm. The cause is usually environmental, such as rotating shift work or long-distance air travel, but some individuals simply have natural circadian rhythms sharply different from the predominant one of their society.

cir·ca·di·an

(ser-kā'dē-ăn),
Relating to biologic variations or rhythms with a cycle of about 24 hours. Compare: infradian, ultradian.
[L. circa, about, + dies, day]

circadian

(sər-kā′dē-ən, -kăd′ē-, sûr′kə-dī′ən, -dē′-)
adj. Biology
Relating to or exhibiting approximately 24-hour periodicity.

cir·ca′di·an·ly adv.

cir·ca·di·an

(sĭr-kā'dē-ăn)
Relating to biologic variations or rhythms with a cycle of about 24 hours.
Compare: infradian, ultradian
[L. circa, about, + dies, day]

circadian

Exhibiting a 24 hour periodicity.

Circadian

Pertaining to biological rhythms occurring at approximately 24-hour intervals. Jet lag is caused by a disruption of the human body's circadian clock.
Mentioned in: Jet Lag

cir·ca·di·an

(sĭr-kā'dē-ăn)
Relating to biologic variations or rhythms with a cycle of about 24 hours.
[L. circa, about, + dies, day]
References in periodicals archive ?
Open to the public this Saturday (August 3), the exhibition will feature Irish and international artists exploring circadian rhythms through reflections on time, the tempo of working life, sleeping patterns, and the impact of modern technologies on biological life.
A team from the University of Guelph posited that the circadian rhythm may also explain the co-occurrence of heart disease and depression.
"Investigating circadian rhythms in innate and adaptive immunity is a great tool to generally understand the physiological interplay and time-dependent succession of events in generating immune responses," Scheiermann says.
Also, importantly, the authors noted that the animals' circadian oscillations were more robust in the fasting group.
A research team studied the circadian response and blood pressure of female mice that lack PER1 and compared them with a healthy female control group.
LE: What is the circadian rhythm and how does it affect human health?
"The results show separate effects of the endogenous circadian system, the behavioral cycle, and circadian misalignment on insulin sensitivity and ?-cell responsivity with relevance for daily glucose regulation in diurnally active people as well as night-shift workers," the authors write.
The diversity and importance of these processes indicate the relation of circadian rhythm with our health and disease.
In the Philippines, there is a team called PhilSHIFT, a group comprised of researchers from the University of the Philippines-Manila who have partnered with circadian and chronotype researchers from the Ludwig Maximillians University Munich Institute of Medical Psychology, to study the chronotypes of Filipino shift workers.
Circadian rhythms in gastropod molluscs, which are a lophotrochozoan clade, were first discovered 50 years ago in Aplysia californica (Kupfermann, 1968; Jacklet, 1972; Block and Lickey, 1973; Lickey et al., 1977).
Circadian rhythms are variations in physiology and behaviour that recur every 24 hours, such as the sleep-wake cycle and daily patterns of hormone release.