During the period of growth, it has been known that the timing of increasing proximal organ systems later than that of distal one in lower extremities. The aim of this study was to examine the growth pattern of foot and lower leg mass(FLM), thigh lean mass(TLM), knee extension torque(KET), and knee flexion torque(KFT), in addition, to establish the peak growth velocity in relation to time of peak height velocity. Subjects were 26 junior youth soccer footballers. FLM and TLM were measured from DXA scan images, in addition, KET and KFT were measured from isokinetic dynamometer at 6 month intervals for two years. FLM, TLM, KET and KFT increased significantly in two years. This means that growth pattern of lower extremities is similar to height and weight. The time peak velocity of KET was the last of measured items. This result suggests that it has possibility knee extensor strength is not enough to act dynamically, like kicking a ball, in junior youth period.
