Quadratus femoris : An EMG investigation during walking and running

Journal article


Semciw, Adam I., Freeman, Michael, Kunstler, Breanne E., Dilani Mendis, M. and Pizzari, Tania. (2015). Quadratus femoris : An EMG investigation during walking and running. Journal of Biomechanics. 48(12), pp. 3433-3439. https://doi.org/10.1016/j.jbiomech.2015.05.029
AuthorsSemciw, Adam I., Freeman, Michael, Kunstler, Breanne E., Dilani Mendis, M. and Pizzari, Tania
Abstract

Dysfunction of hip stabilizing muscles such as quadratus femoris (QF) is identified as a potential source of lower extremity injury during functional tasks like running. Despite these assumptions, there are currently no electromyography (EMG) data that establish the burst activity profile of QF during any functional task like walking or running. The objectives of this study were to characterize and compare the EMG activity profile of QF while walking and running (primary aim) and describe the direction specific action of QF (secondary aim). A bipolar fine-wire intramuscular electrode was inserted via ultrasound guidance into the QF of 10 healthy participants (4 females). Ensemble curves were generated from four walking and running trials, and normalized to maximum voluntary isometric contractions (MVICs). Paired t-tests compared the temporal and amplitude EMG variables. The relative activity of QF in the MVICs was calculated. The QF displayed moderate to high amplitude activity in the stance phase of walking and very high activity during stance in running. During swing, there was minimal QF activity recorded during walking and high amplitudes were present while running (run vs walk effect size=4.23, P<0.001). For the MVICs, external rotation and clam produced the greatest QF activity, with the hip in the anatomical position. This study provides an understanding of the activity demands placed on QF while walking and running. The high activity in late swing during running may signify a synergistic role with other posterior thigh muscles to control deceleration of the limb in preparation for stance.

Keywordship; buttocks; EMG; gait
Year2015
JournalJournal of Biomechanics
Journal citation48 (12), pp. 3433-3439
PublisherElsevier Ltd
ISSN0021-9290
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jbiomech.2015.05.029
Scopus EID2-s2.0-84942837920
Open accessPublished as green open access
Page range3433-3439
FunderLa Trobe University
Author's accepted manuscript
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Open
Publisher's version
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All rights reserved
File Access Level
Controlled
Output statusPublished
Publication dates
Online12 Jun 2015
Publication process dates
Accepted30 May 2015
Deposited31 Oct 2022
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