Human Circadian Rhythms / 수면정신생리
Sleep Medicine and Psychophysiology
;
: 51-60, 2014.
Article
in Korean
| WPRIM
| ID: wpr-95054
ABSTRACT
A 'circadian rhythm' is a self-sustained biological rhythm (cycle) that repeats itself approximately every 24 hours. Circadian rhythms are generated by an internal clock, or pacemaker, and persist even in the absence of environmental time cues, collectively termed 'zeitgebers.' Although organisms generate circadian rhythms internally, they are entrained by environmental stimuli, particularly the light-dark cycle. Measurement of the endogenous melatonin rhythm provides relatively reliable surrogate way of assessing the timing of the internal circadian clock. Also, core body temperature and cortisol can be used as markers of circadian rhythms. The sleep-wake cycle, body temperature, and melatonin rhythm have a stable internal phase relationship in humans and other diurnal species. They play an important role in controlling daily behavioral rhythms including task performance, blood pressure, and synthesis and secretion of several hormones. In this review, we address not only the properties, methods of measurement, and markers of circadian rhythms, but also the physiological and psychological importance of human circadian rhythms.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Task Performance and Analysis
/
Blood Pressure
/
Body Temperature
/
Hydrocortisone
/
Circadian Rhythm
/
Photoperiod
/
Cues
/
Circadian Clocks
/
Melatonin
Limits:
Humans
Language:
Korean
Journal:
Sleep Medicine and Psychophysiology
Year:
2014
Type:
Article
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