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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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PURPOSE: The purpose of this study was to determine the effect of shoulder external rotation on muscle activities of the scapular upward rotators during arm elevation. METHODS: Nineteen healthy subjects with no medical history of shoulder pain or upper extremity disorders were recruited for this study. Electromyography (EMG) was used to measure the muscle activities of the serratus anterior (SA), upper trapezius (UP), lower trapezius (LT) and infraspinatus (IS) muscles during arm elevation. The EMG activities were recorded while the subjects performed $90^{\circ}$ arm elevation with three different arm positions; palm down (PD), neutral position (NP), and palm up (PU). While seated in a chair, the subject was asked to raise the upper extremity in the sagittal plane in random order. Subjects performed $90^{\circ}$ arm elevations in three trials at each arm position. The mean EMG activity normalized by the maximal voluntary isometric contraction was analyzed across three arm positions. Repeated measures one-way ANOVA and the post hoc Bonferroni tests were used to determine the differences in muscle activities among the three arm positions. RESULTS: The EMG activities of the SA and IS were significantly greater in the PU condition than in the other conditions during arm elevation. No significant difference was noted between the NP and PD conditions during arm elevation. CONCLUSION: These results suggest that shoulder external rotation (palm up position) can be used to activate the SA. Therefore, we recommend a scapular protraction exercise in the palm up position for strengthening the SA.
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참고문헌 (31)
참고문헌 신청
Antony NT / 2010 / Effects of posture, movement and hand load on shoulder muscle activity / J Electromyogr Kinesiol 20:191~198
Bagg SD / 1986 / Electromyographic study of the scapular rotators during arm abduction in the scapular plane / Am J Phys Med 65:111~124
Cools AM / 2004 / Evaluation of isokinetic force production and associated muscleactivity in the scapular rotators during a protraction retraction movement in overhead athletes with impingement symptoms / Br J Sports Med 38(1):64~68
Cools AM / 2005 / Isokinetic scapular muscle performance in overhead athletes with and without impingement symptoms / Athl Train 40(2):104~110
Cram JR / 2011 / Introduction to surface electromyography / Apsen
Bagg SD / 1986 / Electromyographic study of the scapular rotators during arm abduction in the scapular plane / Am J Phys Med 65:111~124
Cools AM / 2004 / Evaluation of isokinetic force production and associated muscleactivity in the scapular rotators during a protraction retraction movement in overhead athletes with impingement symptoms / Br J Sports Med 38(1):64~68
Cools AM / 2005 / Isokinetic scapular muscle performance in overhead athletes with and without impingement symptoms / Athl Train 40(2):104~110
Cram JR / 2011 / Introduction to surface electromyography / Apsen
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