| Budget Amount *help |
¥13,360,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2006: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2005: ¥7,700,000 (Direct Cost: ¥7,700,000)
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| Research Abstract |
In order to clear effects of un-uniform thermal environment on sleep and thermoregulatory responses, we carried out the field investigation in the real-life situation and experiment in the climatic chamber.
(1) Experiment. Electroencephalograms, electrooculograms, and mental electromyograms were obtained for all subjects. Their rectal (Tre) and skin (Ts) temperatures were recorded continuously during the sleep session, and the body mass was measured before and after the sleep session. In the winter season, the ambient temperature was set at 10oC with 50% relative humidity and it was used the heating apparatus inside bedding to warm low extremity during sleep. In the summer, 17 male subjects wearing short pyjamas slept on a bed with a cotton blanket under two of the following conditions: (1) air temperature (Ta), 26℃; 50% relative humidity (RH); and air velocity (V), 0.2 m・s-1; (2) Ta, 32℃; 80% RH; and V, 1.7m・s-1; (3) Ta, 32℃; 80% RH; and V, 0.2 m・s-1. No significant differences were ob
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served in the durations of the sleep stages between the subjects under the 26/50 and 32/80 with airflow conditions; however, the total duration of wakefulness decreased significantly in the subjects under the 32/80 with airflow condition as compared to that in the subjects under the 32/80 with still air condition (P < 0.05). The Tre, Tsk, Ts, and body-mass loss under the 32/80 with airflow condition were significantly higher as compared to those under the 26/50 condition and significantly lower than those under the 32/80 with still air condition (P < 0.05). The alleviated heat load due to the increased airflow was considered to be between the 32/80 with still air and the 26/50 conditions. The airflow reduced the duration of wakefulness due to decreasing the Tre, Tsk Ts, and body-mass loss in a warm humid climate.
(2) A field survey on thermal and lighting environment, sleep, thermoregulation and sensation for old persons during the nocturnal sleep period was carried out in the four seasons. The subjects were eight older male and participated in the field survey for a week during the four seasons. The file survey showed that the ambient temperature in the summer season was significantly higher than that in autumn and winter seasons and ambient humidity was lowest in the winter season. There was no significant difference in illuminance among the four seasons. The timing of going to bed was not different among the four seasons, however, the duration of sleeping was shorter in the summer season than that in other seasons because the number and duration of waking during sleep period in the summer was significantly more and longer than that in other seasons. Consequently sleep efficiency index was 88±6%, 83±10%, 89±5%, 89±5% in the spring, summer, autumn and winter seasons, respectively. Although there was no significant difference in Tsk among the four seasons, the skin temperature for forehead and thigh and microclimate humidity inside clothing on the chest showed significantly seasonal difference. Less
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