抄録
The purpose of this study was to clarify the influence of arm swing on jumping performance and jumping motion of lower extremities in vertical jumping. Fourteen healthy male subjects performed two types of vertical jumping with and without arm swing from a squatting position forcefully. During jumping, the positions of eleven body's landmarks attached reflective markers were recorded at 250 Hz using ten motion analysis cameras and the ground reaction forces of each subject's leg were measured with two force plates. Kinematic and kinetic data were calculated. Also, the vertical acceleration of whole body and five body segments of head-trunk, thigh, shank, foot and arm were calculated with the Feltner's algorism. Our data suggested as follows; with arm swing during jumping, 1) the vertical acceleration of whole body was increased and one of thigh contributed to accelerate whole body, 2) the vertical acceleration of head-trunk was inhibited in the middle of jumping motion, and 3) the extension torques of the ankle and the hip joint were increased. It was speculated that the activities of the femoral extensors acted on jumping motion effectively.
