• Title, Summary, Keyword: 일주기리듬

Search Result 48, Processing Time 0.043 seconds

Learning Flow and Fatigue by Circadian Rhythms in College Students (일주기 리듬에 따른 대학생의 학습몰입과 피로)

  • Park, Soonjoo;Kim, Su-In;Nam, Ga-Hyeon;Sung, Je-Hee;Lee, Ju-Won;Cho, Eun-Hee
    • The Journal of the Korea Contents Association
    • /
    • v.14 no.8
    • /
    • pp.319-328
    • /
    • 2014
  • The purpose of this study was to investigate circadian rhythms, learning flow, and fatigue of college students. The differences in learning flow and fatigue according to the type of circadian rhythms were also examined. The study used a descriptive survey research design. The convenience sample consisted of 224 college students from five universities. The data were collected from May to June in 2013 using the following instruments: Morningness-Eveningness Questionnaire-Korean (MEQ-K), Flow State Scale, and Fatigue Assessment Inventory. The participants in the study were mostly put in neither-type (51.8%), and only 4.0% in morning-type. The morning-type students had higher learning flow scores and lower fatigue scores than the night-type students. The types of circadian rhythms measured by MEQ-K were compared to the subjective types of circadian rhythm which was based on the participants' self evaluation. There was a difference in the measured type and the subjective type in 32.1% of the participants. The findings of this study suggest that an intervention program to help college students accurately recognize their circadian rhythms might be effective in improving learning flow and decreasing fatigue.

The Effects of Circadian Rhythm in Subjective Alertness on the Occurrence of Traffic Accidents (주관적 각성도의 일주기(日週期) 리듬이 교통사고 발생에 미치는 영향)

  • Yu, Bum-Hee;Cho, Doo-Young;Jeong, Do-Un
    • Sleep Medicine and Psychophysiology
    • /
    • v.1 no.1
    • /
    • pp.68-75
    • /
    • 1994
  • In order to examine the effects of circadian rhythm in subjective alertness on the occurrence of traffic accidents, the authors investigated the occurrence rate of traffic accidents adjusted to traffic volume in Seoul and the relative rate of fatal accidents versus total traffic accidents in Korea at different times of day in 1991. We analyzed these data in relation with the circadian rhythm in subjective alertness. The results were as follows. Both the occurrence rate of traffic accidents adjusted to traffic volume and the relative rate of fatal accidents versus total traffic accidents were the highest at 3-4 a.m., known as the time period of the lowest subjective alertness. They were negatively correlated with subjective alertness (p<0.05, p<0.001). In conclusion, it is suggested that the circadian rhythm of subjective alertness should have a significant effect on the occurrence of traffic accidents despite many confounding factors such as driving environments.

  • PDF

Rhythmic Control and Physiological Functional Significance of Melatonin Production in Circadian Rhythm (주기적 리듬 조절에 의한 멜라토닌 생산과 생리적 기능의 중요성)

  • Kim, Min Gyun;Park, Seul Ki;Ahn, Soon Cheol
    • Journal of Life Science
    • /
    • v.23 no.8
    • /
    • pp.1064-1072
    • /
    • 2013
  • Circadian rhythm is controlled by hormonal oscillations governing the physiology of all living organisms. In mammals, the main function of the pineal gland is to transform the circadian rhythm generated in the hypothalamic suprachiasmatic nucleus into rhythmic signals of circulating melatonin characterized by a largely nocturnal increase that closely reflects the duration of night time. The pineal gland has lost direct photosensitivity, but responds to light via multi-synaptic pathways that include a subset of retinal ganglion cells. Rhythmic control is achieved through a tight coupling between environmental lighting and arylalkylamine-N-acetyltransferase (AANAT) expression, which is the rhythm-controlling enzyme in melatonin synthesis. Previous studies on the nocturnal expression of AANAT protein have described transcriptional, post-transcriptional, and post-translational regulatory mechanisms. Molecular mechanisms for dependent AANAT expression provide novel aspects for melatonin's circadian rhythmicity. Extensive animal research has linked pineal melatonin for the expression of seasonal rhythmicity in many mammalian species to the modulation of circadian rhythms and to sleep regulation. It has value in treating various circadian rhythm disorders, such as jet lag or shift-work sleep disorders. Melatonin, also, in a broad range of effects with a significant regulation influences many of the body's physiological functions. In addition, this hormone is known to influence reproductive, cardiovascular, and immunological regulation as well as psychiatric disorders.

Assessment and Understanding of Chronotype (일주기 유형의 평가와 이해)

  • Kim, Somin;Kim, Seog Ju
    • Sleep Medicine and Psychophysiology
    • /
    • v.26 no.1
    • /
    • pp.5-15
    • /
    • 2019
  • Chronotype (CT) is defined as an inter-individual difference in sleep-wake cycles and daily activities. Previous studies have suggested that this individual difference can influence our biological and psychological functioning. Literature regarding the psychometric properties and validity of CT measures are reviewed. We provide an overview of biological indicators (sleep-wake cycle, body temperature, cortisol, and melatonin) that are used for distinguishing two chronotypes: morningness (MT) and eveningness (ET). We also review the differences between CT in relation to personality traits and the occurrence of psychopathology. In addition, the methodological limitations of studies on CT are discussed. Finally, future research directions in terms of CT are proposed.

Usefulness of Various Questionnaires in the Assessment of Excessive Daytime Sleepiness and Circadian Rhythm (수면의학(睡眠醫學)에 있어서 지필(紙筆) 척도(尺度)의 활용(活用) -과도한 주간 졸음과 일주기리듬의 평가를 중심으로-)

  • Kim, Moo-Jin
    • Sleep Medicine and Psychophysiology
    • /
    • v.1 no.2
    • /
    • pp.125-144
    • /
    • 1994
  • Recently excessive daytime sleepiness was found to have relations with various social, occupational, and health problems. This condition is common symptom of several sleep disorders, among which sleep apnea syndrome is most contributive. It is essential to assess daytime sleepiness exactly for the diagnosis of such sleep disorders. Multiple sleep latency test which is a valid and objective measurement technique of sleepiness is time and cost consuming, and so there is increasing need of scales measuring general level of daytime sleepiness which are quick and simple to perform for clinical and research purpose. And also, there have been a lot of sleep researches viewing sleep as a chronobiological process, especially in the study of circadian type of shift workers. In these studies they used various techniques of multiple demensions to assess sleepiness or circadian rhythm which concerns various psychological variables. Of these measurement techniques circadian type questionnaires might have some problems in their psychometric properties. So some of these morningness-eveningness questionnaires have been revised and more valid scales are being suggested by different authors. The author briefly reviewed various measurement techniques of sleepiness and circadian rhythm and introduced recently developed scales which are more valid allegedly, and finally discussed psychometric properties of these morningness-eveningness questionnaires.

  • PDF

The Influence of Chronotype and Self-Efficacy on Problem Drinking in Undergraduate Students (대학생의 일주기리듬 유형과 자기효능감이 문제음주에 미치는 영향)

  • Kim, Jeong Hun;Song, Yeoungsuk
    • Journal of Korean Biological Nursing Science
    • /
    • v.21 no.1
    • /
    • pp.70-76
    • /
    • 2019
  • Purpose: The aim of this study is to identify the influence of chronotype and self-efficacy on drinking problem in undergraduate students. Methods: A cross-sectional survey design was adopted for the 177 undergraduate students in D, G, and K city in 2017. The data was analyzed for descriptive statistics, t-test, ANOVA, Pearson's correlation coefficients and multiple regression analysis using the SPSS 18.0 program. Results: Chronotype (${\beta}=-.31$, p< .001), self-efficacy (${\beta}=27$, p< .001) and religion (${\beta}=-.19$, p= .005) were identified as the factors influencing drinking problem in the subjects. The model explained 19% of variance in drinking problem (F= 11.36, p< .001). Conclusion: It is necessary to develop and apply a program that would consider chronotype and self-efficacy factors to reduce the drinking problem in undergraduate students.

The Analysis of Sleep Effect according to Shortwave Length of Natural Light LED (자연광 재현 조명의 단파장 비율에 따른 수면 효과 분석)

  • Kim, Kyeong-Mi;Yu, Mi-Ae;Kim, Young-Won;Lim, Jae-Hyun
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • /
    • pp.1160-1162
    • /
    • 2017
  • 자연광은 시시각각 변화하며 광 특성의 변화는 계절별 시간별 일주기리듬을 갖는다. 이러한 자연광의 리듬은 인간의 감성 또는 수면-각성 패턴과 같은 생체리듬에 영향을 미친다. 인간의 생체리듬은 멜라토닌에 의해 조절되며 특히, 수면-각성주기를 일정한 수면패턴으로 유지하게 한다. 이에 본 논문에서는 자연광의 하루 주기변화에 따라 조명의 단파장 영역 중 446nm~477nm의 비율을 제어하여 심부 체온의 변화를 통해 수면패턴을 분석한다. 분석결과, 자연광의 일몰시간과 유사한 시점에서 446nm~477nm의 비율을 최소로 제어 하였을 때 수면에 긍정적인 영향을 미치는 것을 확인하였다.

Human Circadian Rhythms (인체의 일주기리듬)

  • Lee, Hyunah;Cho, Chul-Hyun;Kim, Leen
    • Sleep Medicine and Psychophysiology
    • /
    • v.21 no.2
    • /
    • pp.51-60
    • /
    • 2014
  • 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.

A Limit Cycle Model about the Entrainment of Circadian Rhythm (일주기 리듬 편승과 관련된 한계주기궤도)

  • Choi, Don-Chan
    • Development and Reproduction
    • /
    • v.12 no.1
    • /
    • pp.9-18
    • /
    • 2008
  • All the organisms on the earth are affected by the repeating signals from the ambient environment caused by the movements of the sun and the earth. Their physiological and behavioral activities such as reproduction, functional pathway of various molecules, and developmental stage, are reflected by the cyclicity whether it is daily(circadian) or annual rhythms. An essential function of circadian rhythms is to provide an internal estimate of the external local time, thereby allowing the organism to program its activities so that they occur at an appropriate time in the daily environment. Of many rhythmic patterns, the circadian rhythms are considered in this review, focusing on the limit cycle, which is a model to investigate the entrainment.

  • PDF