Abstract
[Purpose] The purpose of this study was to investigate the relationship between the movement of the scapula and trunk during arm anterior elevation. [Subjects] Subjects were 20 healthy men. [Methods] We used a slant to measure the angle of scapula rotation, and we used Scion Image to measure the angle of the trunk at 0, 30, 60, 90, 120, and 150 degrees of arm anterior elevation. We investigate the relationship between the movement of the scapula and trunk by regression analysis. [Results] There is significant relationship between scapula rotation and the trunk. This relationship is best fitted with a third order polynomial equation. [Conclusion] We found a correlation between the movement of the scapula and trunk. We consider that when scapula rotation reaches 6.9 degrees the movement of the trunk switches from flexion to extension.
