earticle

영어

This study evaluated the effects of upper trapezius pain (UTP) and head positions on scapuar upwrad rotators’ activities during shoulder abduction on the scapular plane. The study participants included 10 subjects with and without UTP respectively. In forward and neutral head positions, the muscle activity of the upper trapezius (UT), low trapezius (LT), and serratus anterior (SA) was measured during shoulder elevation on the scapular plane. The EMG signals was normalized through maximal voluntary isometric contraction. The muscles’ activities between the two positions was compared using a paired t-test. The UT and SA activities were significantly greater in the group with UTP than the group without UTP (p<0.05). In addition, the UT and SA activities were significantly different between forward and neutral head positions (p<0.05). However, no significant difference in LT activity between with and without UTP, and between the postures was found (p>0.05). These results indicate that the UTP and head position may have may influence on the activities of the UT and SA during should elevation on scapular plane.