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Date Permissions Signed
3-13-2015
Date of Award
Spring 2015
Document Type
Masters Thesis
Degree Name
Master of Science (MS)
Department
Health and Human Development
First Advisor
San Juan, Jun G.
Second Advisor
Suprak, David N. (David Nathan)
Third Advisor
Cunningham, Wren L.
Abstract
The purpose of this study was to investigate the effects of a five-week EMG biofeedback intervention on scapular stabilizer muscle activation, and scapular kinematics, in a healthy population. Twenty males and females participated in the study (n = 10 exercise with biofeedback, n = 10 exercise only). Both groups participated in exercises targeted at activating the serratus anterior and lower trapezius muscles three days a week for five weeks. The exercise with biofeedback group completed a biofeedback session once a week. All subjects were tested at baseline (week 1), week 6, and week 8 for muscle activation of the upper trapezius (UT), lower trapezius (LT), and serratus anterior (SA), as well as scapular kinematics. Statistical analysis was performed using a three-way mixed analysis of variance, and demonstrated that there was no significance A three-way ANOVA revealed no significance for scapular posterior tilt (p = 0.212), upward rotation (p = 0.668), or external rotation (p = 0.880) for neither group. A three-way ANOVA revealed no significance with mean EMG amplitude (p = 0.249). Therefore the hypothesis was rejected. There was a trend toward increased scapular upward rotation for both groups, as well as a decrease in mean UT EMG amplitude for the exercise only group, although not statistically significant. Lowered UT activation is indicative of better musculature control, and could potentially lead to positive alterations in scapular kinematics, observed as increased upward rotation, external rotation, and posterior tilt). This is thought to lead to an increase in subacromial space, and in turn, lessen the risk of onset SIS. The results from this study could assist in the development of a preventative type of program for a healthy population that is at a heightened risk for developing SIS. There is little research investigating the optimal duration and frequency for a preventative type of program, and this protocol used in this study could be a good foundation for future research investigating viable preventative tools for the onset of SIS.
Type
Text
DOI
https://doi.org/10.25710/00jt-nx90
Publisher
Western Washington University
OCLC Number
908692599
Subject – LCSH
Shoulder girdle; Shoulder joint--Range of motion; Biofeedback training; Shoulder joint--Rotator cuff--Wounds and injuries--Prevention; Biomechanics
Format
application/pdf
Genre/Form
masters theses
Language
English
Rights
Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Recommended Citation
Gunderson, Samantha R., "The Effects of a Five-Week Exercise Intervention Using EMG Biofeedback on Scapular Stabilizer Muscle Activation and Scapular Kinematics" (2015). WWU Graduate School Collection. 402.
https://cedar.wwu.edu/wwuet/402