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Title of Journal: Int J Biometeorol

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Abbravation: International Journal of Biometeorology

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Springer-Verlag

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1432-1254

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Effects of season on sleep and skin temperature in

Authors: Kazue OkamotoMizuno Kazuyo Tsuzuki
Publish Date: 2009/12/30
Volume: 54, Issue: 4, Pages: 401-409
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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 3508 ± 157 winter 4265 ± 142 fall 4032 ± 164 and wakefulness increased P  0003 compared to those in fall or winter The sleep efficiency index that was derived from wrist actigraphy was significantly decreased P  0001 in summer 814 ± 29 compared with winter 916 ± 13 or fall 902 ± 12 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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