title: Effect of cardboard under a sleeping bag on sleep stages during daytime nap.
abstract: 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.
authors: Kansei Fukushi Research Center, Tohoku Fukushi University, 1-149-6 Kunimigaoka Aoba Sendai, Miyagi 981-0935, Japan. Electronic address: kazue@tfu-mail.tfu.ac.jp.
authors: Kazue
authors: K
authors: Okamoto-Mizuno
authors: Department of Education, Tohoku Fukushi University, 1-149-6 Kunimigaoka Aoba Sendai, Miyagi 981-0935, Japan.
authors: Koh
authors: K
authors: Mizuno
authors: Department of Rehabilitation, Tohoku Fukushi University, 1-149-6 Kunimigaoka Aoba Sendai, Miyagi 981-0935, Japan.
authors: Motoko
authors: M
authors: Tanabe
authors: Department of Social Welfare, Tohoku Fukushi University, 1-8-1 Kunimi Aoba Sendai, Miyagi 981-8522, Japan.
authors: Katsuko
authors: K
authors: Niwano
mesh_terms: D000328:Adult; D001512:Bedding and Linens; D058639:Cold-Shock Response; D005430:Floors and Floorcoverings / Q000379:methods*; D064368:Healthy Volunteers; D006801:Humans; D006813:Humidity; D008297:Male; D008420:Manufactured Materials; D008834:Microclimate; D017286:Polysomnography; D012881:Skin Temperature; D012894:Sleep Stages; D013696:Temperature; D014934:Wood; D055815:Young Adult
keywords: Mild cold; Sleep; Sleeping bag