The purpose of the present study was to investigate the validity of ultrasonographics for predicting the muscle structure and function of lower limb. Fourteen cadaver's lower limbs were measured by colorized ultrasonography with 3.5MHz and digital caliper for appropriation of this system. Eighty-five adult men and women were subjected for ultrasonography under 0 degree of flexion and 60 degree of flexion during MVC (maximal voluntary contraction) and NC (non-contraction). In addition, maximal

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... scle strength of knee flexion, circum length of thigh and bioelectrical impedance were measured for each subjects. Muscle thickness measured by ultrasonography correlated with that of which measured by caliper. The muscle thickness during NC correlated with the circum length and the body weight. The muscle thickness during MVC correlated with the muscle strength. The ratio of the muscle thickness during MVC to that of NC correlated with the muscle strength.