The Rectus Femoris Muscle Fatigue through Mechanomyographic Time-Frequency Response in Paraplegic Subject - Preliminary Results

Eddy Krueger, Eduardo M. Scheeren, Guilherme N. Nogueira-Neto, Agnelo Denis Vieira, Percy Nohama

2014

Abstract

The purpose of this study is the evaluation of mechanomyographic (MMG) time-frequency response of rectus femoris muscle of a paraplegic subject during an isometric electrically-elapsed fatigue protocol. An accelerometer sensor was used to measure the vibration of muscle during voltage-controlled functional electrical stimulation application at 1 kHz pulse frequency (20% duty cycle) 70 Hz modulated frequency (20% duty cycle). A load cell (50 kgf) measured the force signal with the participant seated on a bench with the hip and knee angle set to 90º. During the protocol the electrical output voltage was adjusted to keep the force at 30% of maximal stimulated contraction (MSC). When the electrical stimulation was unable to keep the force above approximately 10% of MSC the protocol was ceased. Ten seconds with unfatigued (initial period) and fatigued (final period) muscle, MMG signal was processed with Cauchy wavelet transformation (bandpass 5-100 Hz). For fatigue conditions of paraplegic subject, MMG signal presents concentration energy to lower frequencies mainly to 11.31 Hz band frequency.

Paper Citation

in Harvard Style

Krueger E., M. Scheeren E., N. Nogueira-Neto G., Denis Vieira A. and Nohama P. (2014). The Rectus Femoris Muscle Fatigue through Mechanomyographic Time-Frequency Response in Paraplegic Subject - Preliminary Results . In Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2014) ISBN 978-989-758-011-6, pages 239-243. DOI: 10.5220/0004804102390243

in Bibtex Style

@conference{biosignals14,
author={Eddy Krueger and Eduardo M. Scheeren and Guilherme N. Nogueira-Neto and Agnelo Denis Vieira and Percy Nohama},
title={The Rectus Femoris Muscle Fatigue through Mechanomyographic Time-Frequency Response in Paraplegic Subject - Preliminary Results},
booktitle={Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2014)},
year={2014},
pages={239-243},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0004804102390243},
isbn={978-989-758-011-6},
}

in EndNote Style

TY - CONF
JO - Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2014)
TI - The Rectus Femoris Muscle Fatigue through Mechanomyographic Time-Frequency Response in Paraplegic Subject - Preliminary Results
SN - 978-989-758-011-6
AU - Krueger E.
AU - M. Scheeren E.
AU - N. Nogueira-Neto G.
AU - Denis Vieira A.
AU - Nohama P.
PY - 2014
SP - 239
EP - 243
DO - 10.5220/0004804102390243