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KMID : 1211620130080010041
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Journal of the Korean Society of Physical Medicine
2013 Volume.8 No. 1 p.41 ~ p.48
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Effect of Movement Plane and Shoulder Flexion Angle on Scapular Upward Rotator During Scapular Protraction Exercise
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Choung Sung-Dae
Won Jong-Hyuck
Jung Do-Young
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Abstract
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Purpose: This study was to determine the effect of the plane of movement (sagittal plane vs. scapular plane) and shoulder flexion angle (90° vs. 130°) during scapular protraction exercises in healthy subjects by investigating the elecromyographic (EMG) activities of the serratus anterior (SA), upper trapezius (UT), and pectoralis major (PM).
Methods: Twenty-one healthy subjects participated in this study. Subjects performed maximal scapular protraction at the 90° or 130° shoulder flexion angles in the sagittal or scapular planes. Surface EMG was recorded from the SA and UT, and PM muscles. Dependent variables were examined by 2 (plane) × 2 (angle) repeated measures of analysis of ariance(ANOVA).
Results: Significantly increased EMG activities in the †Corresponding Author : jhweon@joongbu.ac.kr This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. SA and UT were found during scapular protraction exercise at the 130° shoulder flexion angle in the sagittal and scapular plane. Also, EMG activity of the PM significantly decreased at the 130° shoulder flexion angle in the sagittal plane and the 90° and 130° shoulder flexion in the scapular plane.
Conclusion: we recommend scapular protraction exercise at the 90° shoulder flexion in the sagittal plane to selectively strengthen the SA muscle with limitation of upper trapezius activity and at the 130° shoulder flexion in the scapular plane to selectively strengthen the SA muscle with limitation of pectoralis major activity.
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KEYWORD
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EMG, Scapular plane, Serratus anterior
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