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    Electromyographic analysis of the three subdivisions of gluteus medius during weight-bearing exercises

    215840_1758-2555-2-17.pdf (1.750Mb)
    Access Status
    Open access
    Authors
    O'Sullivan, Keiran
    Smith, S.
    Sainsbury, David
    Date
    2010
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    O'Sullivan, K. and Smith, S. and Sainsbury, D. 2010. Electromyographic analysis of the three subdivisions of gluteus medius during weight-bearing exercises. Sports Medicine, Arthoscopy, Rehablitation, Therapy and Technology. 2 (17).
    Source Title
    Sports Medicine,Arthoscopy, Rehablitation, Therapy and Technology
    DOI
    10.1186/1758-2555-2-17
    ISSN
    1758-2555
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/2.0/. Please refer to the licence to obtain terms for any further reuse or distribution of this work.

    URI
    http://hdl.handle.net/20.500.11937/46118
    Collection
    • Curtin Research Publications
    Abstract

    Background: Gluteus medius (GM) dysfunction is associated with many musculoskeletal disorders. Rehabilitation exercises aimed at strengthening GM appear to improve lower limb kinematics and reduce pain. However, there is a lack of evidence to identify which exercises best activate GM. In particular, as GM consists of three distinct subdivisions, it is unclear if GM activation is consistent across these subdivisions during exercise. The aim of this study was to determine the activation of the anterior, middle and posterior subdivisions of GM during weight-bearing exercises. Methods: A single session, repeated-measures design. The activity of each GM subdivision was measured in 15 pain-free subjects using surface electromyography (sEMG) during three weight-bearing exercises; wall squat (WS), pelvic drop (PD) and wall press (WP). Muscle activity was expressed relative to maximum voluntary isometric contraction (MVIC). Differences in muscle activation were determined using one-way repeated measures ANOVA with post-hoc Bonferroni analysis.Results: The activation of each GM subdivision during the exercises was significantly different (interaction effect; p < 0.001). There were also significant main effects for muscle subdivision (p < 0.001) and for exercise (p < 0.001). The exercises were progressively more demanding from WS to PD to WP. The exercises caused significantly greater activation of the middle and posterior subdivisions than the anterior subdivision, with the WP significantly increasing the activation of the posterior subdivision (all p < 0.05). Discussion: Posterior GM displayed higher activation across all three exercises than both anterior and middle GM. The WP produced the highest %MVIC activation for all GM subdivisions, and this was most pronounced for posterior GM. Clinicians may use these results to effectively progress strengthening exercises for GM in the rehabilitation of lower extremity injuries.

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