棒高跳の跳躍動作中における上肢のキネティクス

抄録

The purpose of this study was to investigate kinetics of the upper limbs’ joints using an instrumented pole which measures load distribution of axial force exerted by each hand along the pole. Four sets of strain gauges, two of them for measurements of axial loading along the pole and rest of them for bending moments, attached on the pole. The pole was modeled as a series of 11 rigid segments connecting its adjacent segment via virtual joint with rotational spring component. The stiffness of the spring was calculated from the pole deformation measured under loading test. Four male pole vaulters participated in this experiment. A motion capture system was used to measure the 3-D coordinate data of 47 and 24 reflective markers attached to the whole-body and the pole, respectively. The estimated force, calculated from the pole deformation based on static force/moment equilibrium equation, was decomposed into the axial force of each hand according to the ratio in distribution of axial force determined by outputs of the instrumented pole. The results obtained in this study show that the left shoulder and elbow joints exerted large extension torque.