背臥位と直立位の肢位変化が内腹斜筋横方向線維の硬度に与える影響

—組織硬度計を用いた検討—

抄録

The tissue hardness of the internal oblique muscle lateral fibers in the abdomen and pelvis of 13 healthy male subjects was measured using a tissue hardness gauge while lying in a supine position and then in an upright position. This study investigated the changes in tissue hardness between the two positions. The results show that compared with the supine position, the upright position displayed increased tissue hardness in the abdomen and pelvis. This increased tissue hardness in the upright position appears to be related to the effect of the internal oblique muscle lateral fibers in stabilizing both sacroiliac joints, and is also considered to be related to maintaining control against the forward and downward dropping action of the intra-abdominal organs in the upright position. Additionally, it is considered that when the abdomen wall bulges in relation to the forward and downward dropping action of the intra-abdominal organs in the upright position, the skin and subcutaneous tissue in the abdomen and pelvis are stretched, and thus, tissue hardness increases.