To study the effects of kendo uniform and protectors in a hot environment on dehydration during exercise, we compared two conditions ; 30 min exercise with and without kendo uniform and protectors. Five male college kendo fencers performed modelately severe kendo practice at dry bulb temperatures of 30.2 ± 1.0°C and wet bulb temperatures of 24.9 ± 2.1°C. Other five fencers performed bicycle exercise designed to the same intensity as kendo practice at dry bulb temperatures of 36 .5 ± 0.5°C and wet bulb temperatures of 27.0 ± 1.7°C. After both exercises, body weight was significantly decreased, and hematocrit, serum total protein concentration, and heart rate were significantly increased. In kendo practice, however, the decrease in body weight and the increases in hematocrit and serum total protein concentration were significantly higher than those in bicycle exercise. There is no significant difference in the change in heart rate between kendo and bicycle exercises. We conclude that exercise with kendo uniform and protectors in hot environment results in marked dehydration and plasma volume loss, by the increase in sweat, which may be caused by insulation of heat dissipation and/or added heat production by the weight of protectors, and that the improvement of kendo uniform and protectors may prevent marked dehydration and plasma volume loss, and, consequently, heat stroke.

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The Ministry of Education has decided to implement a 5day school week starting from 1992 in our country. In handicapped education, the analysis of leisure activities is very important factor for the handicapped in the future. The purpose of this study was to investigate the leisure activtiy of mental retarded student. The results are as follows;1. Most students watch T.V, listen to the music, walk around in a park or a natural enviroment, ride bicycles or go shopping for leisure during school week.2. The student's leisure activates on Sundays are the same as that of school week.3. On Sundays, students's activity pattern sxpanded and they go out shopp and for lunch or dinner.4. Leisure activities exercised are limited and most of students are alone or with their families.5. In order to fulfill leisure activities for the future, thoughtful and continuous analysis in executive and educational fields are needed.

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It is important to measure the time variations of ground reaction force distributions during physical exercise for designing sport shoes. In this study, a trial measuring system of ground reaction force distributions is developed to verify the basic principle of structure, measurement and calibration. This system is composed of both hardware of a mat-like sensor to be laid on the floor and software of data acquisition and processing system. The hardware consists of an array of 64 pressure transducers, which are made of PZT piezoelectric material. The software provides the spatial distributions of ground reaction force and those time variations by the data collected from all the 64 transducers. As an application of this system developed, the distributions of ground reaction force are measured while man is walking and running on the sensor.

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