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    Transversus abdominis is part of a global not local muscle synergy during arm movement

    194407_194407.pdf (719.6Kb)
    Access Status
    Open access
    Authors
    Morris, Susan
    Lay, B.
    Allison, Garry
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Morris, 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.
    Source Title
    Human Movement Science
    DOI
    10.1016/j.humov.2012.12.011
    ISSN
    01679457
    Remarks

    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. http://dx.doi.org/10.1016/j.humov.2012.12.011

    URI
    http://hdl.handle.net/20.500.11937/46348
    Collection
    • Curtin Research Publications
    Abstract

    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.

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