The purposes of this study were 1) to quantify the dynamic contributions of the individual terms; such as, joint torque term, gravitational term, and motion-dependent term (MDT), to the generation of angular velocity of the swing leg hip joint, and 2) to investigate the main contributors to the hip angular velocity considering the generating factor of the MDT. Three male sprinters performed maximal-effort sprinting. Dynamic contributions of the individual terms were calculated, and then the generating factors of the MDT were quantified using a recurrence formula. The results showed that 1 ) the MDT is one of the great contributors to the hip joint angular velocity, and 2) main contributors of the swing leg hip angular velocity are not only instantaneous and cumulative effects of the swing leg hip joint torque but also instantaneous effect of the contralateral hip joint torque.
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