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dc.contributor.authorHelgadottir, H
dc.contributor.authorKristjansson, E
dc.contributor.authorEinarsson, E
dc.contributor.authorKarduna, A
dc.contributor.authorJonsson, H
dc.date.accessioned2012-05-22T14:40:08Z
dc.date.available2012-05-22T14:40:08Z
dc.date.issued2011-12
dc.date.submitted2012-05-22
dc.identifier.citationJ Electromyogr Kinesiol 2011, 21(6):947-53en_GB
dc.identifier.issn1873-5711
dc.identifier.pmid21889362
dc.identifier.doi10.1016/j.jelekin.2011.07.007
dc.identifier.urihttp://hdl.handle.net/2336/225300
dc.descriptionTo access publisher full text version of this article. Please click on the hyperlink in Additional Links field.en_GB
dc.description.abstractAltered activity in the axioscapular muscles is considered to be an important feature in patients with neck pain. The activity of the serratus anterior (SA) and trapezius muscles during arm elevation has not been investigated in these patients. The objectives of this study was to investigate whether there is a pattern of altered activity in the SA and trapezius in patients with insidious onset neck pain (IONP) (n=22) and whiplash associated disorders (WAD) (n=27). An asymptomatic group was selected for baseline measurements (n=23). Surface electromyography was used to measure the onset of muscle activation and duration of muscle activity of the SA as well as the upper, middle, and lower trapezius during unilateral arm elevation in the three subject groups. Both arms were tested. With no interaction, the main effect for the onset of muscle activation and duration of muscle activity for serratus anterior was statistically significant among the groups. Post hoc comparison revealed a significantly delayed onset of muscle activation and less duration of muscle activity in the IONP group, and in the WAD group compared to the asymptomatic group. There were no group main effects or interaction effects for upper, middle and lower trapezius. This finding may have implications for scapular stability in these patients because the altered activity in the SA may reflect inconsistent or poorly coordinated muscle activation that may reduce the quality of neuromuscular performance and induce an increased load on the cervical and the thoracic spine.
dc.description.sponsorshipIcelandic Centre for Research Landspitali University Hospitalen_GB
dc.language.isoenen
dc.publisherElsevieren_GB
dc.relation.urlhttp://dx.doi.org/10.1016/j.jelekin.2011.07.007en_GB
dc.rightsArchived with thanks to Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiologyen_GB
dc.subject.meshAdaptation, Physiologicalen_GB
dc.subject.meshAdolescenten_GB
dc.subject.meshAdulten_GB
dc.subject.meshArmen_GB
dc.subject.meshFemaleen_GB
dc.subject.meshHumansen_GB
dc.subject.meshMaleen_GB
dc.subject.meshMiddle Ageden_GB
dc.subject.meshMovementen_GB
dc.subject.meshMuscle Contractionen_GB
dc.subject.meshMuscle, Skeletalen_GB
dc.subject.meshNecken_GB
dc.subject.meshNeck Painen_GB
dc.subject.meshRange of Motion, Articularen_GB
dc.subject.meshWhiplash Injuriesen_GB
dc.subject.meshYoung Adulten_GB
dc.titleAltered activity of the serratus anterior during unilateral arm elevation in patients with cervical disorders.en
dc.typeArticleen
dc.contributor.departmentLandspitali The National University Hospital, University of Iceland, Reykjavik, Iceland.en_GB
dc.identifier.journalJournal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiologyen_GB
html.description.abstractAltered activity in the axioscapular muscles is considered to be an important feature in patients with neck pain. The activity of the serratus anterior (SA) and trapezius muscles during arm elevation has not been investigated in these patients. The objectives of this study was to investigate whether there is a pattern of altered activity in the SA and trapezius in patients with insidious onset neck pain (IONP) (n=22) and whiplash associated disorders (WAD) (n=27). An asymptomatic group was selected for baseline measurements (n=23). Surface electromyography was used to measure the onset of muscle activation and duration of muscle activity of the SA as well as the upper, middle, and lower trapezius during unilateral arm elevation in the three subject groups. Both arms were tested. With no interaction, the main effect for the onset of muscle activation and duration of muscle activity for serratus anterior was statistically significant among the groups. Post hoc comparison revealed a significantly delayed onset of muscle activation and less duration of muscle activity in the IONP group, and in the WAD group compared to the asymptomatic group. There were no group main effects or interaction effects for upper, middle and lower trapezius. This finding may have implications for scapular stability in these patients because the altered activity in the SA may reflect inconsistent or poorly coordinated muscle activation that may reduce the quality of neuromuscular performance and induce an increased load on the cervical and the thoracic spine.


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