逆上がりの遊脚期における下肢関節の力学的エネルギーの生成と吸収

抄録

We aimed to investigate the generation and absorption of mechanical energy by the lower limb joints during the arm support phase of kicking pullovers. Thirteen men performed kicking pullovers, and the kinetics and kinematics of the hip, knee, and ankle joints were calculated between takeoff and upside position using a sagittal-plane, 10-segment, rigid body link model. The hip joint of the support leg generated the most energy by flexion torque and large flexion velocity of 331±66 deg/s. This joint was markedly extended at takeoff, which might have allowed for the large angular velocity and the expansion of the impulse by the ground reaction force before takeoff. These observations suggest that a series of movement skills including extension of this joint toward takeoff and rapid flexion of it immediately after takeoff is an important factor to achieve kicking pullover. The hip joint of the swing leg absorbed energy by exerting extension torque, suggesting that a part of the kinetic energy of the swing leg at takeoff was transferred to the trunk with this torque to facilitate the upward migration and backward rotation of the trunk. Hence, further studies on the energy transfer by the lower limb joints are required.