인체의 일주기리듬

• Published in: Sumyŏn--chŏngsin saengni Vol. 21; no. 2; pp. 51 - 60
• Main Authors: 이현아(Hyunah Lee), 조철현(Chul-Hyun Cho), 김린(Leen Kim)
• Format: Journal Article
• Language: Korean
• Published: 대한수면의학회 31.12.2014; The Korean Academy of Sleep Medicine
• Subjects: 정신과학; Human; Melatonin; 인체; Sleep-wake cycle; 수면-각성 주기; 일주기리듬; Circadian rhythm; 멜라토닌; -
• ISSN: 1225-7354; 2713-8631

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.