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http://dx.doi.org/10.13066/kspm.2013.8.1.041

Effect of Movement Plane and Shoulder Flexion Angle on Scapular Upward Rotator During Scapular Protraction Exercise  

Choung, Sung-Dae (Department of Physical Therapy, Yonsei University)
Weon, Jong-Hyuck (Department of Physical Therapy, Joongbu University)
Jung, Do-Young (Department of Physical Therapy, Joongbu University)
Publication Information
Journal of the Korean Society of Physical Medicine / v.8, no.1, 2013 , pp. 41-48 More about this Journal
Abstract
PURPOSE: This study was to determine the effect of the plane of movement (sagittal plane vs. scapular plane) and shoulder flexion angle ($90^{\circ}$ vs. $130^{circ}$) 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 $90^{\circ}$ or $130^{\circ}$ 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) ${\times}$ 2 (angle) repeated measures of analysis of variance (ANOVA). RESULTS: Significantly increased EMG activities in the SA and UT were found during scapular protraction exercise at the $130^{\circ}$ shoulder flexion angle in the sagittal and scapular plane. Also, EMG activity of the PM significantly decreased at the $130^{\circ}$ shoulder flexion angle in the sagittal plane and the $90^{\circ}$ and $130^{\circ}$ shoulder flexion in the scapular plane. CONCLUSION: we recommend scapular protraction exercise at the $90^{\circ}$ shoulder flexion in the sagittal plane to selectively strengthen the SA muscle with limitation of upper trapezius activity and at the $130^{\circ}$ shoulder flexion in the scapular plane to selectively strengthen the SA muscle with limitation of pectoralis major activity.
Keywords
EMG; Scapular plane; Serratus anterior;
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