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KMID : 1812820210050020041
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Journal of Korean Dental Hygiene Science
2021 Volume.5 No. 2 p.41 ~ p.46
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Muscle Activation of Serratus Anterior during Self-Resisted Scapular Protraction with Forward Flexion on Unstable Surface in Sitting Position
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Jang Tae-Jin
Jeon In-Cheol
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Abstract
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Background: The muscle activation of the serratus anterior (SA) is important for the performance of glenohumeral joint during functional activities. However, little research in comparison of SA muscle activation during self-resisted scapular protraction exercises in forward flexion of shoulder has been reported.
Purpose: The purpose of this study was to compare muscle activity of SA during three different scapular protraction exercises according to various conditions [Forward flexion with protraction (FFP), FFP with self-resistance (FFPS), FFPS with hand-exerciser (FFPSH)] in healthy individuals in sitting position.
Study design: Comparative, repeated measures design
Methods: Twenty subjects were participated. The muscle activity of SA, upper trapezius (UT) and pectoralis major (PM) were measured by using a surface electromyography device. Each subject was asked to perform three different scapular protraction exercises (FFP vs. FFPS vs. FFPSH) in random order. One-way repeated measures analysis of the variance and a Bonferroni post hoc test were used. The level of statistical significance was set at α=0.01.
Results: The muscle activity of SA and the SA/UT ratio were significantly different among three conditions (FFP vs. FFPS vs. FFPSH) (p<0.01). The muscle activity of SA and the SA/UT ratio during FFPSH were significantly greater compared to those with FFP and FFPS (p<0.01). However, the SA/PM ratio was not significantly different among three conditions (p>0.05).
Conclusions: FFPSH exercise for facilitation of SA muscle can be recommended.
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KEYWORD
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Forward flexion, Muscle activity, Scapular protraction, Self-resistance, Serratus anterior
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