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날개 어깨뼈 대상자들에게 어깨 내밈 운동시 벌림 각도와 외부 무게에 따른 앞톱니근, 큰가슴근, 위 등세모근의 활성도 및 비율에 미치는 영향

Effect on the Activity and Ratio of the Serratus Anterior, Pectoralis Major, and Upper Trapezius according to the Angle of Abduction and External Weight During Shoulder Protraction Exercise for Winged Scapular Subjects

김태호|박한규|야담바담허럴
한국전문물리치료학회 (Korean Research Society of Physical Therapy)|2019.09|한국전문물리치료학회지 (Physical Therapy Korea)|제26권 제3호|pp. 1-10|DOI https://doi.org/10.12674/ptk.2019.26.3.001

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참고문헌

키워드

Upper trapeziusSerratus anteriorPectoralis majorShoulder protractionWinged scapular.
주제분류물리치료학

초록

Background: Winged scapular (WS) causes muscle imbalance with abnormal patterns when moving the arm. In particular, the over-activation of the upper trapezius (UT) and decrease in activity of the lower trapezius (LT) and serratus anterior (SA) produce abnormal scapulohumeral rhythm. Therefore, the SA requires special attention in all shoulder rehabilitation programs. In fact, many previous studies have been devoted to the SA muscle strength training needed for WS correction. Objects: The purpose of this study was to investigate the effect of shoulder girdle muscle and ratio according to the angle of shoulder abduction and external weight in supine position. Methods: Twenty three WS patients participated in this experiment. They performed scapular protraction exercise in supine position with the weights of 0 ㎏, 1 ㎏, 1.5 ㎏, and 2 ㎏ at shoulder abduction angles of 0˚, 30˚, 60˚, and 90˚. The angle and weight applications were randomized. Surface electromyography (EMG) was used to collect the EMG data of the SA, pectoralis major (PM), and UT during the exercise. The ratio of PM/SA and UT/SA was confirmed. Two-way repeated analyses of variance were used to determine the statistical significance of SA, PM, and UT and the ratios of PM/SA and UT/SA. Results: There was a significant difference in SA according to angle (p<.05). Significant differences were also identified depending on the angle and weight (p<.05). The angle of abduction at 0˚, 30˚ and weight of 2 ㎏ showed the highest SA activity. However, there was no significant difference between PM and UT (p>.05). There was a significant difference between PM/SA and UT/SA in ratio of muscle activity according to angle (p<.05). Significant differences were found at PM/SA angles of 30˚, 60˚ and 90˚ (p<.05). For UT/SA, significant difference was only observed at 90˚ (p<.05). Conclusion: Based on the results of this study, in order to strengthen the SA, it was found to be most effective to use 1 and 1.5 ㎏ weights with abduction angles of 0˚ and 30˚ at shoulder protraction in supine position.

Abstract

Background: Winged scapular (WS) causes muscle imbalance with abnormal patterns when moving the arm. In particular, the over-activation of the upper trapezius (UT) and decrease in activity of the lower trapezius (LT) and serratus anterior (SA) produce abnormal scapulohumeral rhythm. Therefore, the SA requires special attention in all shoulder rehabilitation programs. In fact, many previous studies have been devoted to the SA muscle strength training needed for WS correction. Objects: The purpose of this study was to investigate the effect of shoulder girdle muscle and ratio according to the angle of shoulder abduction and external weight in supine position. Methods: Twenty three WS patients participated in this experiment. They performed scapular protraction exercise in supine position with the weights of 0 ㎏, 1 ㎏, 1.5 ㎏, and 2 ㎏ at shoulder abduction angles of 0˚, 30˚, 60˚, and 90˚. The angle and weight applications were randomized. Surface electromyography (EMG) was used to collect the EMG data of the SA, pectoralis major (PM), and UT during the exercise. The ratio of PM/SA and UT/SA was confirmed. Two-way repeated analyses of variance were used to determine the statistical significance of SA, PM, and UT and the ratios of PM/SA and UT/SA. Results: There was a significant difference in SA according to angle (p<.05). Significant differences were also identified depending on the angle and weight (p<.05). The angle of abduction at 0˚, 30˚ and weight of 2 ㎏ showed the highest SA activity. However, there was no significant difference between PM and UT (p>.05). There was a significant difference between PM/SA and UT/SA in ratio of muscle activity according to angle (p<.05). Significant differences were found at PM/SA angles of 30˚, 60˚ and 90˚ (p<.05). For UT/SA, significant difference was only observed at 90˚ (p<.05). Conclusion: Based on the results of this study, in order to strengthen the SA, it was found to be most effective to use 1 and 1.5 ㎏ weights with abduction angles of 0˚ and 30˚ at shoulder protraction in supine position.

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