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    Changes in mechanical load and extensor muscle activity in the cervico-thoracic spine induced by sitting posture modification

    Access Status
    Fulltext not available
    Authors
    Edmondston, Stephen
    Sharp, M.
    Symes, A.
    Alhabib, N.
    Allison, Garry
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Edmondston, Stephen J. and Sharp, Michael and Symes, Andrew and Alhabib, Nawaf and Allison, Garry T. 2011. Changes in mechanical load and extensor muscle activity in the cervico-thoracic spine induced by sitting posture modification. Ergonomics. 54 (2): pp. 179-186.
    Source Title
    Ergonomics
    DOI
    10.1080/00140139.2010.544765
    ISSN
    00140139
    School
    School of Physiotherapy
    URI
    http://hdl.handle.net/20.500.11937/30690
    Collection
    • Curtin Research Publications
    Abstract

    The influence of whole body sitting posture on cervico-thoracic posture, mechanical load and extensor muscle activity was examined in 23 asymptomatic adults. Cervical and upper thoracic extensor muscle activity measured in guided slouched and lumbo-pelvic neutral postures was normalised to that measured in a self-selected habitual posture. Head and neck posture and gravitational load moment measurements were obtained in each posture. Sagittal head translation, upper cervical extension and load moment were significantly greater in the slouched posture (p < 0.001). Contrasting patterns of cervical and thoracic extensor activity were observed in the slouched and neutral postures, with cervical extensor activity 40% higher in the slouched posture (p < 0.0001). Thoracic extensor activity was significantly higher in the lumbo-pelvic neutral posture than the habitual posture (p = 0.002). The significant changes in extensor muscle activity with postural modification appear to be induced by the associated change in mechanical load moment of the head.

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