Abstract
The purpose of this study was to examine influences of the arm swing velocity on kinetic variables of lower extremity on squat jump. Eighteen healthy male subjects were recruited to perform the squat jump with arm swing (SJA) and without arm swing (SJ). Landmark positions and ground reaction force were recorded by 10 high-speed cameras and 2 force-platforms, simultaneously. Kinematic data (angle and angular velocity) and kinetic data (torque, power, and work) were calculated. The results showed that the performance of SJA (34.6 ± 5.5 cm) is significantly higher than that of SJ (29.8 ± 4.5cm). There were no relationships between the arm swing velocity (at takeoffand peak value) and the jump height. The hip joint angular velocity was affected by the arm swing. There was a trend of a positive correlation between the shoulder angular velocity and the ankle angular velocity at the takeoff. As a result, these results suggested that the arm swing motion increased the ankle power significantly and the larger ankle angular velocity helped the hip power and the ankle power act effectively on jump.
