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.

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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