The variation of physical fitness and strength during adolescence have been studied with reference differential increment groups of standing height. The results were as follows:
　1) Physical fitness and index scores of height spurt group in boy tend to fall below the little increment groups of standing height.
　2) In girls, group of posterior to height spurt group were above the little increment group and height spurt group in height, weight and physical fitness scores, but its index scores fall below the other groups. It suggest that height gain in girls is followed by weight gain, and strength increment spurt begin for the last time.
　3) An increase in strength of height increment above 3.5cm per half-year group was inferior to the group of 2~3.5cm per half-year.
　4) A comparison of elbow joint changes indicated arm strength at 130 degree of height spurt group was almost as great as right angle.

DESCENTE SPORTS SCIENCE Vol.5/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE