Correlation Analysis between Shoulder Abduction Angles and Normalized Muscle Activity of Scapular Muscles during Y-Raise Exercise with Elastic Resistance

• 발행기관: KEMA학회
• 저자명: Byeong-Hun Hwang In-Cheol Jeon
• 간행물 정보: 『Journal of Musculoskeletal Science and Technology』제9권 제1호, 44~50쪽, 전체 7쪽
• 주제분류: 의약학 > 재활의학
• 파일형태: PDF
• 발행일자: 2025.06.30

국문 초록

Background: Different angles of shoulder abduction during the Y-raise exercise with an elastic band induce changes in the muscle activity of the upper trapezius (UT), lower trapezius (LT), and serratus anterior (SA). To efficiently increase LT activation during the Y-raise exercise with an elastic band, it is necessary to inhibit UT activity. Purpose: This study aimed to investigate the correlation between shoulder abduction angles (160°, 150°, and 140°) of Y-raise exercise with an elastic band and the normalized muscle activity of UT, LT, and SA. Study design: Cross-sectional study Methods: Fifteen healthy participants were recruited for this study. The participants performed the Y-raise exercise at three different shoulder abduction angles (160°, 150°, and 140°). Surface electromyography (sEMG) was used to measure the muscle activity of UT, LT, and SA during the Y-raise exercise. The EMG data were normalized using Z-score normalization to standardize the value of individual variance. The correlation between shoulder abduction angles and normalized muscle activity was analyzed using Spearman correlation coefficients. Results: The correlation values between shoulder abduction angles (160°, 150°, and 140°) and normalized muscle activities were as follows: UT Z-score (r = –0.85, p = 0.001), LT Z-score (r = 0.22, p = 0.16), and SA Z-score (r = 0.93, p = 0.001), respectively. Conclusions: A shoulder abduction angle of 160° can be recommended during the Y-raise exercise with an elastic band for the selective inhibition of UT and efficient muscle activation of LT

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키워드

Correlation Elastic resistance Reciprocal inhibition Scapular muscles Y-raise exercise