Prediction of muscular architecture of the rectus femoris and vastus lateralis from EMG during isometric contractions in soccer players

Chauhan, Bhawesh, Hamzeh, Maher A., & Cuesta-Vargas, Antonio I. (2013) Prediction of muscular architecture of the rectus femoris and vastus lateralis from EMG during isometric contractions in soccer players. SpringerPlus, 2(548).

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Objectives The purpose of the study was to establish regression equations that could be used to predict muscle thickness and pennation angle at different intensities from electromyography (EMG) based measures of muscle activation during isometric contractions.

Design Cross-sectional study.

Methods Simultaneous ultrasonography and EMG were used to measure pennation angle, muscle thickness and muscle activity of the rectus femoris and vastus lateralis muscles, respectively, during graded isometric knee extension contractions performed on a Cybex dynamometer. Data form fifteen male soccer players were collected in increments of approximately 25% intensity of the maximum voluntary contraction (MVC) ranging from rest to MVC.

Results There was a significant correlation (P < 0.05) between ultrasound predictors and EMG measures for the muscle thickness of rectus femoris with an R2 value of 0.68. There was no significant correlation (P > 0.05) between ultrasound pennation angle for the vastus lateralis predictors for EMG muscle activity with an R2 value of 0.40.

Conclusions The regression equations can be used to characterise muscle thickness more accurately and to determine how it changes with contraction intensity, this provides improved estimates of muscle force when using musculoskeletal models.

Impact and interest:

3 citations in Scopus
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3 citations in Web of Science®

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ID Code: 64182
Item Type: Journal Article
Refereed: Yes
Keywords: Pennation angle, Muscle thickness, Sonomyography, Electromyography, Rectus femoris, Vastus lateralis, Isometric contraction
DOI: 10.1186/2193-1801-2-548
ISSN: 2193-1801
Divisions: Current > Schools > School of Clinical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Copyright Owner: Copyright 2013 the authors
Copyright Statement: This is an open access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Deposited On: 07 Nov 2013 23:35
Last Modified: 22 May 2015 03:57

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