Control of linear and angular momentum in the vertical jump

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  • 垂直跳における運動量および角運動量制御

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<p>This study aimed to elucidate the role of joints and arm swing motion in controlling linear and angular momentum in vertical jumps. Twenty-eight participants performed maximal effort vertical jumps, and data on jumping motion (500 Hz) and ground reaction force (1000 Hz) were collected. The contributions of each joint torque to the linear and angular momentum of the whole body, arm, trunk, and leg were calculated by induced acceleration analysis. The role of the ankle joint torque was to acquire the vertical momentum of the whole body by external forces. The role of the knee joint torque was to regulate the horizontal and angular momentum of the whole body. The role of the hip joint torque was to distribute the momentum of the leg to the trunk by internal forces. The role of the virtual trunk joint torque was to distribute the angular momentum of the lower limb to the trunk by internal forces, and to control the distribution of horizontal momentum between segments. The arm joint torques did not affect the acquisition and distribution of these linear and angular momenta. However, the arm swing motion may have played a role as a counterweight to cancel the horizontal and angular momentum due to the motion-dependent forces acting on the whole body.</p>

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