Torque-related changes in mechanomyographic intensity patterns for the superficial quadriceps femoris muscles

Travis W. Beck, Matt S. Stock and Jason M. DeFreitas

Computer Methods in Biomechanics and Biomedical Engineering, 2014, vol. 17, issue 7, 714-722

Abstract: The purpose of this study was to investigate changes in mechanomyographic (MMG) intensity patterns for the vastus lateralis (VL), rectus femoris (RF) and vastus medialis (VM) during submaximal to maximal concentric isokinetic, eccentric isokinetic and isometric muscle actions of the leg extensors. Eleven men (mean ± SD age = 20.1 ± 1.1 years) performed concentric, eccentric and isometric muscle actions of the dominant leg extensors on 3 separate days. Surface MMG signals were detected from the VL, RF and VM, processed with a wavelet analysis and examined with a trend plot. The results indicated that the trend plot was capable of tracking systematic changes in MMG amplitude and frequency with an increase in torque. However, these changes were statistically significant in only 26% of the cases. There were also no consistent differences between muscles or contraction types for the significance of the trend plots.

Date: 2014
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DOI: 10.1080/10255842.2012.715155

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