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Effects of seasonal illumination and thermal environments on sleep in elderly men

机译：季节照明和热环境对老年人睡眠的影响

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The purpose of this study was to investigate the effect of changes in the seasonal thermal environment and illuminance on sleep in older men by using actigraphy. Eight healthy male volunteers with a mean age of 64 +/- 1 years served as subjects. The measurements were obtained in 4 consecutive seasons: spring, summer, autumn, and winter. The activity level and illuminance were monitored using a wrist actigraph system with illuminance meter for 5 consecutive days. Sleep parameters were determined using an actigraph-based, sleep-wake identification algorithm. The temperature and humidity in the bedroom of the subjects' homes were measured continuously for 5 days. During the actigraphic measurement, skin temperature and the temperature and humidity of the microclimate were measured continuously for 2 nights. Bedroom nocturnal Ta and humidity was significantly higher in the summer than in the other seasons. Sleep efficiency was worst in the summer due to the increased number and duration of nocturnal awakenings. However, a significant difference was not found in the subjective evaluation of sleep among the 4 seasons. The correlations between the sleep parameters and environmental factors such as temperature, humidity, and illuminance levels measured at the same time showed that increased lighting level before the sleep prolongs the bedtime and wake time after sleep onset, and became wake-up time earlier. Increased ta, humidity, and lighting level during the sleep period mount up the wake time after sleep onset and impaired the sleep efficiency index. (C) 2014 Elsevier Ltd. All rights reserved.
机译：这项研究的目的是通过使用书法来研究季节性热环境和照度的变化对老年男性睡眠的影响。八名健康男性志愿者的平均年龄为64 +/- 1岁。在春季，夏季，秋季和冬季四个连续的季节中获得了测量值。使用带有照度计的腕部活动记录仪系统连续5天监测活动水平和照度。使用基于活动记录仪的睡眠唤醒识别算法确定睡眠参数。连续5天测量受试者房屋卧室的温度和湿度。在活性测量期间，连续2晚连续测量皮肤温度和微气候的温度和湿度。夏季的卧室夜间Ta和湿度显着高于其他季节。由于夜间觉醒的次数和持续时间增加，夏季的睡眠效率最差。但是，在四个季节之间的主观睡眠评估中未发现显着差异。睡眠参数与同时测量的环境因素（例如温度，湿度和照度水平）之间的相关性表明，睡眠前增加的照明水平会延长入睡时间和入睡后的起床时间，并更早地起床。睡眠期间增加的ta，湿度和照明水平会增加睡眠开始后的唤醒时间，并损害睡眠效率指数。 （C）2014 Elsevier Ltd.保留所有权利。

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