Time Study and EneI'gy Mctabolism Measurernent in Primary School Children and Senior High School Students

Abstract

Time study and the energy metabolism of primary and senior high school students aged from 6 to 18, in Kyoto were studied from May to October 1958, and the following results were obtained. 1) As for the time spent for eating, personal preparation, and school attending, no significant difference were obtained between primary and senior high school students. As students grow older, they slept the shorter but studied the longer and took exercise including sports activities, the shorter. In the 3rd grade of senior high school, boys studied 200〜300 minutes for the preparation of the coming entrance examination, in addition to their formal studies in the school, while girls spent 60-120 minutes for cooking and other house keeping work. 2) Caloric expenditure per day were about 1400-1800 Cal. for boys, 1200-1600Cal.for girls in primary school, 2500 Cal for senior high school boys and 2000Cal. for girls in senior high school respectivery. In senior high school, boys consumed 200 Cal. more than girls in the same grade. Because of their sedentary work for the entrance examillation the 3rd grade boys in senior high school spent less than 2300 Cal. per day. 3) The calrie expenditure of primary school children and senior high school students, were found to be in the normal range. The sume of calorie expenditure found in this study, estimated calorie loss in digestion and absorption, and estimate calories required for growing was nearly equal to or rather less than the caloric allowance for the average Japanese Youth.