Although a physical activity is the most essential thing in physical education, there is little information on an amount of activity of children during education periods for lack of measuring procedure for it.
　An actogram on which animal behavior in wild condition was recorded, was employed in animal ecological research. In this experiment the actogram and heart rate were telemetered to determine the amount or behavior pattern and relative strenuousness of various activities during physical education periods in junior high school children.
　As index representing the amount of the activity the pedometer step rate was counted from the actogram. The pedometer step rate was much in a jumping, running walking and other activities like a locomotive exercise and lesser in standing and calisthenics.
　Mean step rate was 62.6 steps/min for basketball-class and 73.7 steps/min for soccer-class. Also mean heart rate was 118 beats/min for basketball-class and 131 beats/min for soccer-class. There were 0.83-0.86 coefficients of correlation between the pedometer step rate and heart rate at statistical significance.
　A total of 187 junior high school children, from first to third grade, took measures of step rate during two different classes of physical education by means of the pedometer. Average step rate and estimated heart rate by regression equation per one physical education period was 2,054 steps and 116 beats/min for basketball-class and 3,712 steps and 125 beats/min for soccer-class, respectively.

DESCENTE SPORTS SCIENCE Vol.3/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE