A7 重量物挙上時の体幹の回旋動作に対する骨盤回旋の役割(動作解析2・他)

概要

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The purpose of this study was to clarify a role of pelvic twist in trunk rotation movement during asymmetric lifting tasks when varying posture of the lower extremity joints. The effects of external rotation of the right foot on pelvic twist and trunk rotation movement were examined from the viewpoint of kinematics data. Six healthy male subjects performed asymmetrical lifting tasks with 12kg loads on three external rotation angles of the right foot that were 0, 30 and 60 degrees. During the lifting tasks, the 3D loci of the anatomical landmarks attached 30 reflective markers were recorded at 120Hz using ten motion analysis cameras, and Euler angles of eight body segments were calculated by the rigid body link segment model. The relationships between pelvic twist and trunk rotation, and hip joint rotation were discussed. These data showed as follows ; with increasing external rotation angle of the right foot, 1) the right hip joint rotated externally, 2) the ratio of pelvic twist to the maximum rotation angle of the trunk was increased and pelvic twist contributed to rotate the trunk, and 3) at the maximum rotation of the trunk, internal rotation angle of the right hip joint decreased. This suggested that for asymmetric lifting tasks external rotation posture of the lower extremity contributed to reduce loads on the low back and internal rotator of the hip joint.
社団法人日本機械学会の論文
2006-11-08