立位下方リーチ肢位保持における体幹・骨盤・股関節のアラインメント変化について

抄録

In this study, we assessed changes in trunk, pelvic, and hip-joint alignment during downward reach from a standing position. Eight healthy adult men participated in this study. First, the subjects looked at their feet in a standing position and pointed their fingertips toward their toes. From this position, they were instructed to reach for their toes in random 2-cm increments up to 16 cm. They were instructed to maintain each position for 5 seconds. Postural images were taken with a digital camera of the sagittal plane during the task. From these images, the angles of thoracic vertebrae flexion, thoracolumbar vertebrae flexion, lumbar vertebrae flexion, forward pelvic flexion, and hip flexion were calculated, using ImageJ. No statistically significant difference in the thoracic vertebrae flexion angle was observed. There was a statistically significant increase in the thoracolumbar vertebrae flexion angle at more than 10 cm, forward pelvic flexion angle at more than 12 cm, and hip flexion angle at more than 6 cm. The results suggest that these angles have certain effects as task components. In addition, the flexion angle of the lumbar vertebrae tended to increase gradually with an increase in the reach distance and showed a statistically significant increase at more than 8 cm. This result suggests that this angle also has an important effect as a task component. The results of the angle changes of thoracic vertebrae flexion and thoracolumbar vertebrae flexion are considered to reflect the flexural mobility of those joints. Moreover, the results of the angle changes of lumbar vertebrae flexion and forward pelvic flexion are thought to reflect the movement of those joints, namely, the lumbar-pelvic rhythm as reported by previous studies.