Retraction 145
The results of the kinematic and EMG data and the muscle
activity ratio for retraction 145 are shown in Table VI. With
trunk rotation, the angle of scapular upward rotation significantly
decreased, but the scapular posterior tilting and ER
were not changed. In addition, with trunk rotation, the EMG
activity of theUTand SAsignificantly decreased, the UT/MT
and UT/LT ratios significantly decreased, but the UT/SA
ratio significantly increased.