어깨뼈 아래쪽돌림증후군 대상자에 있어서 어깨뼈 아래쪽돌림근 스트레칭이 팔을 드는 동안 어깨뼈 위쪽돌림근의 근활성도에 미치는 영향 = Effect of Scapular Downward Rotator Stretch Exercises on Activity of Scapular Upward Rotators During Arm Elevation in Subjects with Scapular Downward Rotation Syndrome

다국어 초록 (Multilingual Abstract)

Background and purpose : Scapular alignment impairment changes the length and tension of cervicoscapular muscles and it also affects scapulo-humeral motion. Scapular downward rotation syndrome can influence the muscle activity of the scapular upward rotators and mobility of the scapula due to passive insufficiency of the scapular downward rotators. The purpose of this study was to investigate the effects of scapular downward rotator stretch exercises on the muscle activity of scapular upward rotators during arm elevation in subjects with scapular downward rotation syndrome.

Methods : Sixteen people with scapular downward rotation syndrome participated and twenty one shoulders were targeted. Subjects performed three stretching exercises for twenty minutes to stretch the scapular downward rotators. To investigate the effectiveness of the stretching exercises, the muscle activity of the levator scapula, upper trapezius, lower trapezius and serratus anterior muscles were measured at shoulder flexions of 90˚, 120˚, and 150˚ pre- and post-exercise. All muscle activity was measured by surface electromyography to obtain a root mean square value. The muscle activity for each muscle group was expressed as a percentage of the mean maximal voluntary isometric contraction (%MVIC). Two-way repeated measures analysis of variance was used to determine the changes in muscle activity pre- and post-exercise, and according to shoulder flexion angles. Bonferroni correction was used for the post-test (α=.05). If a significant difference was found, a paired-sample t-test was performed at α=.017 (05/3).

Results : As a result of comparing the muscle activity for the shoulder flexion angles, the activity of the levator scapular, upper trapezius and serratus anterior muscle was significantly increased (p<.017). However, lower trapezius muscle activity was significantly greater at a shoulder flexion of 150° (p<.017). As a result of comparing muscle activity pre- and post-exercise and at different shoulder flexion angles, analysis showed that levator scapular and upper trapezius muscle activity was significantly decreased at a shoulder flexion of 150° (p<.017). In addition serratus anterior muscle activity was significantly decreased at a shoulder flexion of 120°, and 150° (p<.017). Lower trapezius muscle activity was not significantly different among all shoulder flexion angles and pre- and post-exercise (p>.017).
Conclusion : This study suggests that scapular downward rotator muscle stretching exercises should be performed before strengthening exercises to improve the mobility of people with scapular downward rotation syndrome.

목차 (Table of Contents)

• Ⅰ. 서 론 1
• Ⅱ. 연구방법 5
• 1. 연구대상자 5
• 2. 실험기기 및 도구 7
• 3. 실험과정 9
• 4. 운동방법 11
• 5. 자료 수집 및 처리 13
• 6. 분석방법 14
• Ⅲ. 결 과 15
• Ⅳ. 고 찰 19
• Ⅴ. 결 론 22
• 참고문헌 24
• Abstract 29