![]() ![]() Martin JS, Hébert M, Ledoux É et al (2012) Relationship of chronotype to sleep, light exposure, and work-related fatigue in student workers. Roenneberg T, Hut R, Daan S, Merrow M (2010) Entrainment concepts revisited. Roenneberg T, Kumar CJ, Merrow M (2007) The human circadian clock entrains to sun time. Parsons MJ, Moffitt TE, Gregory AM et al (2015) Social jetlag, obesity and metabolic disorder: investigation in a cohort study. Levandovski R, Dantas G, Fernandes LC et al (2011) Depression scores associate with chronotype and social jetlag in a rural population. ![]() Roenneberg T, Allebrandt KV, Merrow M, Vetter C (2012) Social jetlag and obesity. Wittmann M, Dinich J, Merrow M, Roenneberg T (2006) Social jetlag: misalignment of biological and social time. doi: 10.2337/dc15-0302Īmerican Academy of Sleep Medicine (2001) International classification of sleep disorders, revised: diagnostic and coding manual. Vetter C, Devore EE, Ramin CA et al (2015) Mismatch of sleep and work timing and risk of type 2 diabetes. Vyas MV, Garg AX, Iansavichus AV et al (2012) Shift work and vascular events: systematic review and meta-analysis. Hansen J, Lassen CF (2012) Nested case-control study of night shift work and breast cancer risk among women in the Danish military. Gan Y, Yang C, Tong X et al (2015) Shift work and diabetes mellitus: a meta-analysis of observational studies. ![]() Wang X-S, Armstrong MEG, Cairns BJ et al (2011) Shift work and chronic disease: the epidemiological evidence. doi: 10.1016/j.smrv.2007.07.005ĭaan S, Beersma DG, Borbély AA (1984) Timing of human sleep: recovery process gated by a circadian pacemaker. Roenneberg T, Kuehnle T, Juda M et al (2007) Epidemiology of the human circadian clock. These findings indicate that chronotype might be modified during remission, which should be further investigated in longitudinal studies. Additionally, light exposure in remitted patients was significantly higher, but this finding was mediated by living in a rural environment. ![]() However, patients with remitted depression slept significantly longer on work-free days and reported a worse subjective sleep quality than controls. In our sample, adolescents with remitted depression showed similar chronotypes and similar amounts of social jetlag compared to controls. Given the potentially mediating effect of light on chronotype and depressive symptoms, we measured light exposure with a light sensor on the actimeter. For this purpose, we assessed chronotype and social jetlag with the Munich ChronoType Questionnaire (MCTQ), subjective sleep quality with the Pittsburgh Sleep Quality Index (PSQI) and used continuous wrist-actimetry over 31 consecutive days to determine objective sleep timing. In this study, we investigated whether adolescents with remitted depression differ from healthy controls in terms of chronotype, social jetlag and other sleep-related variables. A late chronotype as well as a misalignment between internal time and external time such as social jetlag has been shown to be associated with depressive symptoms in adults. Chronotype is mostly regulated by the circadian clock that synchronises the internal time of the body with the external light dark cycle. One important sleep variable is self-selected sleep timing, which is also referred to as chronotype. The relationship between sleep and adolescent depression is much discussed, but still not fully understood. ![]()
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