The Effect of a Combination of Scapular Protraction With Resistance and Forward Flexion of the Shoulder on Serratus Anterior Muscle Activity
(주)코리아스칼라
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- 2023.04.05
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- 2016.11
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서지정보
ㆍ발행기관 : 한국전문물리치료학회
ㆍ수록지정보 : 한국전문물리치료학회지 / 23권 / 4호
ㆍ저자명 : Sung-hoon Jung, In-cheol Jeon, Ui-jae Hwang, Jun-hee Kim, Oh-yun Kwon
영어 초록
Background: The functioning of the serratus anterior (SA) muscle is essential to normal scapulohumeral rhythm during forward flexion (FF) of the shoulder. Also, SA weakness and overuse of the upper trapezius (UT) is observed in patients with shoulder dysfunction and trapezius myalgia. We designed a combination exercise involving FF and scapular protraction with resistance (CFFSP) to activate the SA muscle and to deactivate the UT muscle.
Objects: The purpose of this study was to determine whether or not CFFSP would be more effective in activating the SA muscle than FF alone and FF with scapular protraction (FFP).
Methods: Nineteen subjects (12 men and 7 women) participated in this study and performed FF, FFP, and CFFSP at 120°. Surface electromyography was applied to the SA, UT, and pectoralis major (PM) muscles, as was one-way analysis of variance (ANOVA) with repeated measures. Statistical significance was set at .05. Bonferroni adjustment was used to counteract the problem of multiple comparisons, with a statistical level of significance of .017 (.05/3).
Results: A statistically significant difference was found in relation to the three positions for the SA muscle (p<.001) and the SA/UT ratio (p=.005) using ANOVA. Significantly different results, depending on the position, were also demonstrated using the Bonferroni post-hoc test for the SA muscle (FF=28.27±16.20, FFP=45.66±15.81, and CFFSP=62.4±27.21) and for the SA/UT ratio (FF=3.04±2.14, FFP=3.61±2.38, and CFFSP=5.95±3.01). Significant differences between the three positions was not found regarding the average amplitude of SA/PM muscle ratio (SA/PM: p=.060).
Conclusion: We recommend the use of CFFSP to strengthen the SA muscle at 120°.
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