2008 年 8 巻 p. 69-73
We have experimented with physical therapy for patients with difficulty of body weight transfer due to hyperactivity of the latissimus dorsi and muscular contractions. For lateral body weight transfer, training changed the distance of lateral transfer in the sitting position. Recent electromyographic (EMG) studies on the latissimus dorsi reported activities in its upper and lower fibers in the scapular brachial joint during trunk exercise. However, the activities of this muscle on lateral transfer in the sitting position have not been analyzed. In this study, we examined the influence of changes in the distance of lateral transfer in the sitting position using the EMG of the upper and lower fibers of the latissimus dorsi. Initially, in the end-sitting position (starting limb position), in which the bilateral arms were folded, we measured integrated EMG (iEMG) for the upper and lower fibers of the bilateral latissimus dorsi. Subsequently, the shoulder girdle was transferred in the lateral direction at distances of 5, 10, 15, and 20 cm without inclining or rotating the line between the bilateral acromions, while maintaining the head in the vertical position, with both feet placed on the ground from the starting limb position. We determined the respective iEMGs. There were no significant lateral transfer distance-related changes in the relative iEMG for the upper and lower fibers of the mobile side latissimus dorsi. Furthermore, the value for the upper fibers of the non-mobile side increased with the distance of lateral transfer. In addition, the value for the lower fibers of the non-mobile side also elevated with the lateral transfer distance; at a distance of 20 cm, the value was significantly higher than those at distances of 5 and 10 cm. Based on the results of this study, it may be important to evaluate the abdominal oblique muscles, dorsolumbar muscles, and latissimus dorsi in performing lateral body weight transfer. Training chang the distance of lateral transfer in the sitting position of patients with difficulty of lateral transfer . In addition, the actions of the upper fibers of the latissimus dorsi differed from those of the lower fibers, suggesting the necessity of assessing these fibers individually.