National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan.
Int J Biometeorol. 2010 Jul;54(4):401-9. doi: 10.1007/s00484-009-0291-7. Epub 2009 Dec 30.
The effects of season on sleep and skin temperature (Tsk) in 19 healthy, elderly volunteers were investigated. Measurements were obtained in summer, winter, and fall, and activity levels were monitored using a wrist actigraph system for five consecutive days. The temperature and humidity of the bedrooms of the subjects' homes were measured continuously for five days. During actigraphic measurement, Tsk during sleep was measured for two nights. The bedroom temperature and humidity significantly increased in summer compared to winter and fall. In summer, the total sleep time decreased (mean +/- SE min; summer, 350.8 +/- 15.7; winter, 426.5 +/- 14.2; fall, 403.2 +/- 16.4) and wakefulness increased (P < 0.003) compared to those in fall or winter. The sleep efficiency index that was derived from wrist actigraphy was significantly decreased (P < 0.001) in summer (81.4 +/- 2.9%) compared with winter (91.6 +/- 1.3%) or fall (90.2 +/- 1.2%). The forehead Tsk significantly increased, while the chest and thigh Tsks were decreased in summer compared to those in fall or winter. These results suggest that, in the elderly, sleep is disturbed in summer more than in other seasons, and that this disturbance is related to fluctuations in Tsk.
研究了 19 名健康老年人的季节对睡眠和皮肤温度（Tsk）的影响。在夏季、冬季和秋季分别进行了测量，并使用腕部活动记录仪系统连续五天监测活动水平。受试者家中卧室的温度和湿度连续五天进行了测量。在活动记录仪测量期间，夜间睡眠时测量了两天的 Tsk。与冬季和秋季相比，夏季卧室温度和湿度显著升高。与秋季或冬季相比，夏季总睡眠时间减少（平均值 +/- SE min；夏季 350.8 +/- 15.7；冬季 426.5 +/- 14.2；秋季 403.2 +/- 16.4），觉醒增加（P < 0.003）。源自腕部活动记录仪的睡眠效率指数在夏季（81.4 +/- 2.9%）明显低于冬季（91.6 +/- 1.3%）或秋季（90.2 +/- 1.2%）（P < 0.001）。与秋季或冬季相比，夏季额头 Tsk 显著升高，而胸部和大腿 Tsk 降低。这些结果表明，在老年人中，夏季的睡眠比其他季节更易受到干扰，这种干扰与 Tsk 的波动有关。
