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Arm posture influences on regional supraspinatus and infraspinatus activation in isometric arm elevation efforts

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dc.contributor.authorAlenabi, Talia
dc.contributor.authorWhittaker, Rachel
dc.contributor.authorKim, Soo Y.
dc.contributor.authorDickerson, Clark R.
dc.date.accessioned2019-01-04T18:40:21Z
dc.date.available2019-01-04T18:40:21Z
dc.date.issued2019-02
dc.descriptionThe final publication is available at Elsevier via https://doi.org/10.1016/j.jelekin.2018.12.005. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.description.abstractThis study aimed to evaluate the effect of arm posture on activation of the anterior and posterior regions of supraspinatus and the superior and middle regions of infraspinatus during resisted isometric arm elevations. Thirty-one healthy participants performed 18 isometric resistance exertions against a force cube in three elevation planes (flexion, scaption, abduction) and three elevation angles (30°, 90°, 150°) in maximal and sub-maximal resistance conditions. EMG data were obtained using four pairs of fine wire electrodes. The mean activation of each region and the activation ratios were compared across postures using ANOVAs. Supraspinatus anterior was significantly more active during abduction and scaption, and in higher elevation angles, while the posterior region showed similar activation levels across postures. Infraspinatus regions were more active during flexion with more relative activation of the infraspinatus superior at 90° flexion. The results suggest that regional activation of supraspinatus and infraspinatus should be considered for assessment and rehabilitation purposes. In any clinical setting where it is important to reduce the stress on the supraspinatus anterior, isometric flexion exercises performed with arm in low elevation angles could provide the opportunity to strengthen the posterior region of supraspinatus with limited stress on the anterior region. Beside external rotation exertions, resisted flexion tests may be useful for evaluation of infraspinatus regions.en
dc.description.sponsorshipNatural Sciences and Engineering Research Council [311895-2016]en
dc.description.sponsorshipCanada Foundation for Innovation
dc.description.sponsorshipOntario Research Fund
dc.description.sponsorshipCanada Research Chair in Shoulder Mechanics
dc.identifier.urihttps://doi.org/10.1016/j.jelekin.2018.12.005
dc.identifier.urihttp://hdl.handle.net/10012/14309
dc.language.isoenen
dc.publisherElsevieren
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectsupraspinatus regionsen
dc.subjectinfraspinatus regionsen
dc.subjectfine wire EMGen
dc.subjectarm postureen
dc.subjectshoulderen
dc.subjectarm elevationen
dc.titleArm posture influences on regional supraspinatus and infraspinatus activation in isometric arm elevation effortsen
dc.typeArticleen
dcterms.bibliographicCitationT. Alenabi, R.L. Whittaker, S.Y. Kim, C.R. Dickerson, Arm Posture Influences on Regional Supraspinatus and Infraspinatus Activation in Isometric Arm Elevation Efforts, Journal of Electromyography and Kinesiology (2018), doi: https://doi.org/10.1016/j.jelekin.2018.12.005en
uws.contributor.affiliation1Faculty of Applied Health Sciencesen
uws.contributor.affiliation2Kinesiologyen
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen
uws.scholarLevelGraduateen
uws.typeOfResourceTexten

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