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dc.contributor.authorMorris, Susan
dc.contributor.authorLay, B.
dc.contributor.authorAllison, Garry
dc.identifier.citationMorris, Susan and Lay, Brendan and Allison, Garry. 2013. Transversus abdominis is part of a global not local muscle synergy during arm movement. Human Movement Science. 32 (5): pp. 1176-1185.

The trunk muscle transversus abdominis (TrA) is thought to be controlled independently of the global trunk muscles. Methodological issues in the 1990s research such as unilateral electromyography and a limited range of arm movements justify a re-examination of this theory. The hypothesis tested is that TrA bilateral co-contraction is a typical muscle synergy during arm movement. The activity of 6 pairs of trunk and lower limb muscles was recorded using bilateral electromyography during anticipatory postural adjustments (APAs) associated with the arm movements. The integrated APA electromyographical signals were analyzed for muscle synergy using Principle Component Analysis. TrA does not typically bilaterally co-contract during arm movements (1 out of 6 participants did). APA muscle activity of all muscles during asymmetrical arm movements typically reflected a direction specific diagonal pattern incorporating a twisting motion to transfer energy from the ground up. This finding is not consistent with the hypothesis that TrA plays a unique role providing bilateral, feedforward, multidirectional stiffening of the spine. This has significant implications to the theories underlying the role of TrA in back pain and in the training of isolated bilateral co-contraction of TrA in the prophylaxis of back pain.

dc.publisherElsevier BV; North Holland
dc.subjectPostural control
dc.subjectAnticipatory postural adjustments
dc.subjectTrunk stability
dc.subjectLow back pain
dc.subjectAbdominal muscles
dc.titleTransversus abdominis is part of a global not local muscle synergy during arm movement
dc.typeJournal Article
dcterms.source.titleHuman Movement Science

NOTICE: This is the author’s version of a work that was accepted for publication in Human Movement Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Human Movement Science, Volume 32, Issue 5, October 2013, Pages 1176–1185.

curtin.accessStatusOpen access

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