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    An examination of the flexion-relaxation phenomenon in the cervical spine in lumbo-pelvic sitting

    Access Status
    Fulltext not available
    Authors
    Burnett, A.
    O'Sullivan, Peter
    Caneiro, J.
    Krug, R.
    Bochmann, F.
    Helgestad, G.
    Date
    2009
    Type
    Journal Article
    
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    Citation
    Burnett, A. and O'Sullivan, P. and Caneiro, J. and Krug, R. and Bochmann, F. and Helgestad, G. 2009. An examination of the flexion-relaxation phenomenon in the cervical spine in lumbo-pelvic sitting. Journal of Electromyography and Kinesiology. 19 (4): pp. e229-e236.
    Source Title
    Journal of Electromyography and Kinesiology
    DOI
    10.1016/j.jelekin.2008.04.015
    ISSN
    1050-6411
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/46023
    Collection
    • Curtin Research Publications
    Abstract

    The flexion-relaxation phenomenon (FRP) is well documented at end-range lumbar spine flexion in both standing and sitting however, the FRP has been insufficiently investigated in cervico-thoracic musculature. The aim of this study was to determine whether the FRP occurs during forward flexion of the neck, in lumbo-pelvic sitting, amongst a pain-free population. Surface electromyography (EMG) was used to measure muscle activation in 20 (10 men, 10 women) asymptomatic subjects in selected cervico-thoracic muscles during four, 5-s phases (upright posture, forward flexion, full flexion and return to upright) while subjects were positioned in lumbo-pelvic sitting. Spinal kinematics were simultaneously measured using an electromagnetic motion tracking device. No FRP was observed in upper trapezius or thoracic erector spinae (T4). When using visual methods to determine the presence/absence of the FRP, five subjects were believed to show evidence of the FRP in the cervical erector spinae. However, when using various non-visual criteria to determine the existence of the FRP, substantial variations (0-13 subjects) were evident. We recommend that criteria based upon relatively large differences in muscle activation should be considered when defining the FRP. These findings are of significance for future investigations examining specific cervical pain disorders. © 2008 Elsevier Ltd. All rights reserved.

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