Applicability of the coactivation method in assessing synergies of the scapular stabilizing muscles

Hypothesis This study investigated the feasibility of quantifying the coactivation levels in the evaluation of synergisms of the scapular stabilizing muscles during the elevation and lowering of the arms. This method, which quantifies the overlapping area of the normalized electromyographic (EMG) ac...

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Veröffentlicht in:Journal of shoulder and elbow surgery 2009-09, Vol.18 (5), p.764-772
Hauptverfasser: Faria, Christina Danielli Coelho de Morais, PT, MSc, Teixeira-Salmela, Luci Fuscaldi, PT, PhD, Gomes, Pollyanna Figueiredo, PT, MSc
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container_end_page 772
container_issue 5
container_start_page 764
container_title Journal of shoulder and elbow surgery
container_volume 18
creator Faria, Christina Danielli Coelho de Morais, PT, MSc
Teixeira-Salmela, Luci Fuscaldi, PT, PhD
Gomes, Pollyanna Figueiredo, PT, MSc
description Hypothesis This study investigated the feasibility of quantifying the coactivation levels in the evaluation of synergisms of the scapular stabilizing muscles during the elevation and lowering of the arms. This method, which quantifies the overlapping area of the normalized electromyographic (EMG) activity, could be applicable in assessing such muscular synergies. Materials and methods Both shoulders of 10 healthy volunteers were assessed. The coactivation of 3 synergic muscular groups (upper, middle and lower trapezius; upper trapezius and serratus anterior; middle trapezius and serratus anterior) and the isolated electromyographic activity of each muscle were analyzed. Results Analysis of variance revealed that the coactivation values between the synergic groups were different from the isolated levels of each respective muscle for both movements (24.42 < F < 40.12; df =6; p < 0.001). The coactivation values of all groups during elevation were different from those during the lowering of the arms (13.31 < F < 959.92; df =1; p ≤ 0.002), with progressive increases in EMG activity during the elevation and decreases during the lowering of the arms. Conclusion The significant differences in EMG activity between the isolated and the coactivation methods indicated that the coactivation method was adequate to assess the scapular muscular synergies. Level of evidence Basic science study.
doi_str_mv 10.1016/j.jse.2009.02.019
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This method, which quantifies the overlapping area of the normalized electromyographic (EMG) activity, could be applicable in assessing such muscular synergies. Materials and methods Both shoulders of 10 healthy volunteers were assessed. The coactivation of 3 synergic muscular groups (upper, middle and lower trapezius; upper trapezius and serratus anterior; middle trapezius and serratus anterior) and the isolated electromyographic activity of each muscle were analyzed. Results Analysis of variance revealed that the coactivation values between the synergic groups were different from the isolated levels of each respective muscle for both movements (24.42 &lt; F &lt; 40.12; df =6; p &lt; 0.001). The coactivation values of all groups during elevation were different from those during the lowering of the arms (13.31 &lt; F &lt; 959.92; df =1; p ≤ 0.002), with progressive increases in EMG activity during the elevation and decreases during the lowering of the arms. Conclusion The significant differences in EMG activity between the isolated and the coactivation methods indicated that the coactivation method was adequate to assess the scapular muscular synergies. 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This method, which quantifies the overlapping area of the normalized electromyographic (EMG) activity, could be applicable in assessing such muscular synergies. Materials and methods Both shoulders of 10 healthy volunteers were assessed. The coactivation of 3 synergic muscular groups (upper, middle and lower trapezius; upper trapezius and serratus anterior; middle trapezius and serratus anterior) and the isolated electromyographic activity of each muscle were analyzed. Results Analysis of variance revealed that the coactivation values between the synergic groups were different from the isolated levels of each respective muscle for both movements (24.42 &lt; F &lt; 40.12; df =6; p &lt; 0.001). The coactivation values of all groups during elevation were different from those during the lowering of the arms (13.31 &lt; F &lt; 959.92; df =1; p ≤ 0.002), with progressive increases in EMG activity during the elevation and decreases during the lowering of the arms. 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Teixeira-Salmela, Luci Fuscaldi, PT, PhD ; Gomes, Pollyanna Figueiredo, PT, MSc</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c437t-8e5c299bc3aa0e4c1daa14f9473442a964110c91a123cca375dfd3d5636d5d23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Adult</topic><topic>Analysis of Variance</topic><topic>Anthropometry</topic><topic>Arm - physiology</topic><topic>Biological and medical sciences</topic><topic>Body Mass Index</topic><topic>Cohort Studies</topic><topic>Diseases of the osteoarticular system</topic><topic>Electromyography</topic><topic>Female</topic><topic>Humans</topic><topic>Male</topic><topic>Medical sciences</topic><topic>Muscle Contraction - physiology</topic><topic>Muscle Relaxation - physiology</topic><topic>Muscle, Skeletal - physiology</topic><topic>Orthopedics</topic><topic>Orthopedics - methods</topic><topic>Probability</topic><topic>Range of Motion, Articular - physiology</topic><topic>Reference Values</topic><topic>Scapula - physiology</topic><topic>scapular muscles</topic><topic>shoulder</topic><topic>Shoulder Joint - physiology</topic><topic>synergies</topic><topic>Young Adult</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Faria, Christina Danielli Coelho de Morais, PT, MSc</creatorcontrib><creatorcontrib>Teixeira-Salmela, Luci Fuscaldi, PT, PhD</creatorcontrib><creatorcontrib>Gomes, Pollyanna Figueiredo, PT, MSc</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of shoulder and elbow surgery</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Faria, Christina Danielli Coelho de Morais, PT, MSc</au><au>Teixeira-Salmela, Luci Fuscaldi, PT, PhD</au><au>Gomes, Pollyanna Figueiredo, PT, MSc</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Applicability of the coactivation method in assessing synergies of the scapular stabilizing muscles</atitle><jtitle>Journal of shoulder and elbow surgery</jtitle><addtitle>J Shoulder Elbow Surg</addtitle><date>2009-09-01</date><risdate>2009</risdate><volume>18</volume><issue>5</issue><spage>764</spage><epage>772</epage><pages>764-772</pages><issn>1058-2746</issn><eissn>1532-6500</eissn><abstract>Hypothesis This study investigated the feasibility of quantifying the coactivation levels in the evaluation of synergisms of the scapular stabilizing muscles during the elevation and lowering of the arms. This method, which quantifies the overlapping area of the normalized electromyographic (EMG) activity, could be applicable in assessing such muscular synergies. Materials and methods Both shoulders of 10 healthy volunteers were assessed. The coactivation of 3 synergic muscular groups (upper, middle and lower trapezius; upper trapezius and serratus anterior; middle trapezius and serratus anterior) and the isolated electromyographic activity of each muscle were analyzed. Results Analysis of variance revealed that the coactivation values between the synergic groups were different from the isolated levels of each respective muscle for both movements (24.42 &lt; F &lt; 40.12; df =6; p &lt; 0.001). The coactivation values of all groups during elevation were different from those during the lowering of the arms (13.31 &lt; F &lt; 959.92; df =1; p ≤ 0.002), with progressive increases in EMG activity during the elevation and decreases during the lowering of the arms. 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subjects Adult
Analysis of Variance
Anthropometry
Arm - physiology
Biological and medical sciences
Body Mass Index
Cohort Studies
Diseases of the osteoarticular system
Electromyography
Female
Humans
Male
Medical sciences
Muscle Contraction - physiology
Muscle Relaxation - physiology
Muscle, Skeletal - physiology
Orthopedics
Orthopedics - methods
Probability
Range of Motion, Articular - physiology
Reference Values
Scapula - physiology
scapular muscles
shoulder
Shoulder Joint - physiology
synergies
Young Adult
title Applicability of the coactivation method in assessing synergies of the scapular stabilizing muscles
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