The purpose of this paper is to study the relationship between the position of waist belts and the characteristics of the lower body for women. Tape measurements and silhouette photographs were taken of 50 young women ranging in age from 20 to 29 wearing a belt in the standing position.The results are as follows:

1)Top of the low-rise waist belt at the center back was almost the same height as the iliac crest, and lower at the center front compared to the center back.

2)Principle component factors were summarized as three principle components by a 71% contribution ratio. Considering only the low-rise waist belt position, the 1st principle component was interpreted as the waist belt height factor; the 2nd principle component was interpreted as the belt circumstance factor; and the 3rd principle component was interpreted as the belt's curvature factor. Between the measurements of belt wearing location and the body measurements with high factor loading in these three principle components indicated a strong relationship.

3)Height differences between the back and front waist belts to express belt curvature were examined by multiple regressions analysis. The results showed that buttock peak depth [Pd1], abdominal extension depth [AEd] and waist breadth [Wb] could be extracted as explanatory variables. And a significant prediction efficiency was obtained.

Effects of sleep environment in the summer on the sleep of school-aged children were investigated. The 24 healthy school-aged children subjects were divided by age into 2groups: 6-7 years old (Y-group), and 11-12 years old (O-group). The study was performed at the children's residences in the summer and fall. Wrist actigraphy, temperature, and relative humidity (RH) outside and inside the bedroom, bed climate, subjective sleep, and thermal and comfort sensations were measured. The bedroom temperature and humidity were significantly higher in the summer than in the fall. The mean activity and wakefulness significantly increased, whereas the sleep-time and sleep-efficiency index slgnificantly decreased in Y-group compared to the O-group. The bed climate temperature significantly decreased in the later segment of sleep in Y-group compared to the O-group in the summer, whereas it significantly increased in Y-group compared to O-group in the fall. A significantly warmer thermal sensation during sleep was noted in Y-than in O-groups. These results indicate that although the bedroom climate did not significantly differ, the sleep parameters and bed climate significantly differed between the Y-and O-groups.