Effects of season on sleep and skin temperature in the elderly |
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Authors: | Kazue Okamoto-Mizuno Kazuyo Tsuzuki |
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Institution: | (1) National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, 1-1-1 Higashi, Tsukuba Ibaraki, 305-8566, Japan;(2) Center for Welfare & Health Improvement, Tohoku Fukushi University, 6-149-1 Kunimigaoka, Aoba-ku, Sendai Miyagi, 989-3201, Japan |
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Abstract: | 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. |
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Keywords: | |
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