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The relationship between light exposure and sleep, fatigue, and depression in cancer outpatients: Test of the mediating effect

机译：癌症门诊患者的光照与睡眠，疲劳和抑郁之间的关系：介导作用的检验

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BACKGROUND:: Light is an important cue for the entrainment of circadian rhythms, which can be related to sleep quality, fatigue, and depression in cancer patients. OBJECTIVES:: The purpose of this study was to determine the effects of light exposure on sleep quality, fatigue, and depression in cancer patients, to test whether the effect of light exposure on sleep quality, fatigue, and depression was mediated by the other 2 symptoms. METHODS:: This was a cross-sectional study for which we recruited 163 cancer outpatients. For 3 consecutive days, they wore an Actiwatch to measure light exposure. Instruments included the Pittsburgh Sleep Quality Index-Taiwan form, the Brief Fatigue Inventory-Taiwan form, and the Beck Depression Inventory II-Taiwan version. RESULTS:: The results indicated that the Pittsburgh Sleep Quality Index-Taiwan form score was significantly and negatively correlated with minutes of light exposure (MLE) of 1000 lux or greater (r = -0.61, P < .001) and the intensity of light exposure under activity (r = -0.59, P < .001). Fatigue was negatively correlated with MLE (r = -0.18, P = .03). Depression was also negatively correlated with MLE and intensity of light exposure (both r = -0.18, P = .02). Most important, the effect of light exposure on sleep quality, fatigue, and depression was mediated by the other 2 symptoms. CONCLUSION:: Light exposure appeared to be a shared factor for the co-occurrence of fatigue, sleep disturbances, and depression. IMPLICATIONS FOR PRACTICE:: Light exposure has great potential for improving sleep quality as well as ameliorating fatigue and depression in cancer outpatients.
机译：背景：光是引起昼夜节律的重要线索，昼夜节律可能与癌症患者的睡眠质量，疲劳和抑郁有关。目的：本研究的目的是确定光照对癌症患者睡眠质量，疲劳和抑郁的影响，以测试光照对睡眠质量，疲劳和抑郁的影响是否由其他2种介导。症状。方法：这是一项横断面研究，我们招募了163名癌症门诊患者。他们连续三天戴着Actiwatch来测量光照。仪器包括匹兹堡睡眠质量指数-台湾表格，简要疲劳量表-台湾表格和贝克抑郁量表II-台湾版。结果：结果表明，匹兹堡睡眠质量指数-台湾形态评分与1000 lux或更高的暴露时间（MLE）和光照强度呈显着负相关（r = -0.61，P <.001）活动下暴露（r = -0.59，P <.001）。疲劳与MLE呈负相关（r = -0.18，P = .03）。抑郁也与MLE和光照强度呈负相关（r = -0.18，P = .02）。最重要的是，光照对睡眠质量，疲劳和抑郁的影响是由其他两种症状介导的。结论：光照似乎是疲劳，睡眠障碍和抑郁症并发的共同因素。实践的意义：光照对改善门诊患者的睡眠质量以及减轻疲劳和抑郁具有巨大潜力。

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