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KMID : 1151220190250010029
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Journal of Korean Academy of Orthopedic Manual Therapy
2019 Volume.25 No. 1 p.29 ~ p.36
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Comparison of Muscle Activities Serratus Anterior and Upper Trapezius Muscle During Scapular Protraction in Quadruped Position at Legs Difference
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Kim Hee-Gon
Hwang Byeong-Jun
Kim Jong-Woo
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Abstract
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Background: This study was conducted to investigate the effect of leg lift difference on the serratus anterior muscle and the upper trapezius muscle when a subject with winged scapula performs a scapula protraction exercise in a four-leg crawling posture.
Method: Twenty normal adults and 20 subjects with winged scapula participated in the experiment. Surface EMG recordings were collected from serratus anterior muscle and back trapezius muscle during scapula protraction exercises. Scapular winging is measured with the lifting distance of scapula retraction to the back using an electronic digital caliper. In two groups of four-leg crawling posture, the two legs support, the dominant leg lifting, and the non-dominant leg lifting, including the scapula protraction, were performed. To examine the difference between groups in the variance analysis, the Bonferroni correction was used (significance level α=.017). Statistical significance level α was .05.
Results: There was a significant difference in serratus anterior muscle and upper trapezius muscle during push-up plus exercise in leg lifting in four-leg crawling posture, but there were no significant differences in muscle activity between serratus anterior muscle and upper trapezius muscle, and there was no significant difference according to the presence or absence of scapular winging.
Conclusion: For the shoulder stability of the ipsilateral side with the serratus anterior muscle, the leg-lifting posture is effective in the four-leg crawling, and also when a subject with winged scapula chooses an exercise, lifting the ipsilateral side of leg with scapula protraction exercises at the same time may have a positive effect on scapula dysfunction.
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KEYWORD
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druped position , Serratus anterior muscle Activities , winging scapular
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