The contents of this study examine the effects on the movement of a thrower (tori) when performing SEOINAGE. Specifically, the angle of the elbow and shoulder, the angle of the knee, and the degree to which the upper body bends forward were compared between when a thrown (uke) took a neutral posture, a defensive posture, and a forward bent posture. Movement was recorded by way of six high-speed infrared cameras, which was then analyzed through threedimensional movement analysis software. The results indicate that when disregarding the posture of the uke, four tendencies can be observed in the movement of the joint angle from the beginning of the technique until completion. However, in regards to the posture of the uke, the largest difference which occurred was that when in a defensive position and forward bent position, in comparison with a neutral position, it was confirmed that tori sharply bends his/her elbow joint, which constricts the movement of the lifting hand, further closes the armpit, sharply bends at the knee, and overly hunches over his/her upper body.
