Examination of pelvic tilt angle during forward reaching in the sitting position

Abstract

This study examined and compared the pelvic tilt angle and movement characteristics of a forward-reaching task at different speeds in the sitting position. Seven healthy males each performed a forward-reaching movement toward a target 20 cm ahead within periods of 2 seconds, 1 second, and 0.5 second. It was found that the thoracic vertebra tended to bend immediately after the initiation of movement in all the tasks. Additionally, in the 2-second and 1-second tasks, the pelvis showed a change in angle, tilting forward at initiation of the movement. In the 0.5-second task, however, the pelvis exhibited a slight change in angle, tilting backward to maintain posture at the initiation of movement.