Gluteus minimus: an intramuscular EMG investigation of anterior and posterior segments during gait

Semciw, Adam I., Green, Rodney A., Murley, George S. and Pizzari, Tania (2014) Gluteus minimus: an intramuscular EMG investigation of anterior and posterior segments during gait. Gait and Posture, 39 2: 822-826. doi:10.1016/j.gaitpost.2013.11.008

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Author Semciw, Adam I.
Green, Rodney A.
Murley, George S.
Pizzari, Tania
Title Gluteus minimus: an intramuscular EMG investigation of anterior and posterior segments during gait
Journal name Gait and Posture   Check publisher's open access policy
ISSN 0966-6362
Publication date 2014-02
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.gaitpost.2013.11.008
Open Access Status File (Author Post-print)
Volume 39
Issue 2
Start page 822
End page 826
Total pages 5
Place of publication Amsterdam Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Abstract Gluteus minimus is believed to consist of two structurally and functionally unique segments (anterior and posterior); however there is a lack of electromyography (EMG) research that attempts to verify current theoretical knowledge of this muscle. The purpose of this study was therefore to evaluate the function of gluteus minimus during gait, and to determine whether anterior and posterior segments are functionally independent. Bipolar fine wire intramuscular EMG electrodes were inserted into anterior and posterior gluteus minimus segments of fifteen healthy volunteers (9 males) according to previously verified guidelines. Participants completed a series of four walking trials, followed by maximum voluntary isometric contractions in five different positions. Temporal and amplitude variables for each segment were compared across the gait cycle with independent t-tests. The relative contribution of each segment to the maximum resisted trials was compared with Mann-Whitney U tests (α=0.05). Anterior and posterior segments were contracting at different relative intensities for three of the five maximum resisted trials (effect size=0.39 to 0.62, P<. 0.037). The posterior segment was larger in EMG amplitude (peak and average) during the first 20% of the gait cycle (effect size=0.96 to 1.03, P<. 0.02), while the anterior segment peaked later in the stance phase (effect size=0.83, P=0.034). Gluteus minimus is therefore composed of functionally independent segments. These results build on contemporary theoretical knowledge and may signify hip stabilising roles for each segment across different phases of the gait cycle.
Keyword Hip
Gluteus minimus
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Health and Rehabilitation Sciences Publications
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Created: Mon, 23 Feb 2015, 12:19:33 EST by Ms Kate Rowe on behalf of School of Health & Rehabilitation Sciences