Fourteen healthy male subjects slept from 13:30 to 15:30 under ambient temperature and relative humidity maintained at 15 °C and 60%, respectively. They slept under two conditions: in a sleeping bag on wooden flooring (Wood) and in a sleeping bag with corrugated cardboard between the bag and the flooring (CC). Polysomnography, skin temperature (Tsk), microclimate, bed climate, and subjective sensations were obtained. The number of awakenings in the CC had significantly decreased compared to that in the Wood. The mean, back, and thigh Tsk, and bed climate temperature were significantly higher in the CC than that in the Wood. Subjective thermal sensations were warmer in the CC than in the Wood. These results suggest that using corrugated cardboard under a sleeping bag may reduce cold stress, thereby decreasing the number of awakenings and increasing subjective warmth; the mean, back, and thigh Tsk; and bed climate temperature.
(健常男性14人を対象として、15℃／60%に設定した人工気候室で13:30から15:30まで消灯する昼寝の実験を行った。実験は1人につき2回行い、1回は木製合板の上に寝袋で、もう1回は寝袋と合板の間に段ボールを重ねて敷いた。段ボールベッド条件では、合板のみの条件に比して、睡眠プリグラフィで評価した中途覚醒回数が有意に少なく、皮膚温、および主観的な温冷感にも差異が認められた。これらの知見から、体育館のような床で眠る際、下に敷く段ボールの有効性が示唆された。)
27-32
Okamoto-Mizuno K , Mizuno K,Tanabe M, Niwano K
