Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators

INTRODUCTION: In the study of human biomechanics, it is often desirable to evaluate fatigue in the muscles that are involved in performing a particular task. Identifying the phenomena responsible for this condition is a problem that in most cases is complex and requires appropriate research mechanisms. Isokinetic dynamometry (ID) and surface electromyography (SEMG) are two techniques widely used in studies on strength and muscle fatigue. Their effectiveness is conditioned upon a good understanding of their limitations and the adoption of procedures to fully exploit the potential of each one. The main goal of the present study is to verify whether the electromyographic parameters, especially the conduction velocity (CV), are sensitive to the fatigue instauration process within sets of maximal isokinetic contractions. CV is a basic physiological parameter directly related to muscle activity and still little explored in experiments combining ID and SEMG. METHODS: Instrumentation architecture that combines ID and SEMG was used to estimate electromyographic and biomechanical parameters in protocols of maximum intensity isokinetic knee extension exercises. This architecture allows for limiting the parameter estimates to a specific region of isokinetic exercise, called the isokinetic load range (ILR), where one can consider that the angular velocity is constant and the SEMG signals are cyclo-stationary. Electromyographic signals were acquired using an array of electrodes. CONCLUSION: The results suggest that CV and the other SEMG parameters, including amplitude and frequency descriptors, are sensitive to detect a fatigue process only in protocols that restrict the analysis to ILR and that also bring the subject to a state of fatigue quickly.

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Main Authors: Schwartz,Fabiano Peruzzo, Bottaro,Martim, Celes,Rodrigo Souza, Pereira,Maria Claudia, Rocha Júnior,Valdinar de Araújo, Nascimento,Francisco Assis de Oliveira
Format: Digital revista
Language:English
Published: SBEB - Sociedade Brasileira de Engenharia Biomédica 2014
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-31512014000400004
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spelling oai:scielo:S1517-315120140004000042015-01-15Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicatorsSchwartz,Fabiano PeruzzoBottaro,MartimCeles,Rodrigo SouzaPereira,Maria ClaudiaRocha Júnior,Valdinar de AraújoNascimento,Francisco Assis de Oliveira Muscular fatigue Dynamic contraction Isokinetic dynamometry Surface electromyography INTRODUCTION: In the study of human biomechanics, it is often desirable to evaluate fatigue in the muscles that are involved in performing a particular task. Identifying the phenomena responsible for this condition is a problem that in most cases is complex and requires appropriate research mechanisms. Isokinetic dynamometry (ID) and surface electromyography (SEMG) are two techniques widely used in studies on strength and muscle fatigue. Their effectiveness is conditioned upon a good understanding of their limitations and the adoption of procedures to fully exploit the potential of each one. The main goal of the present study is to verify whether the electromyographic parameters, especially the conduction velocity (CV), are sensitive to the fatigue instauration process within sets of maximal isokinetic contractions. CV is a basic physiological parameter directly related to muscle activity and still little explored in experiments combining ID and SEMG. METHODS: Instrumentation architecture that combines ID and SEMG was used to estimate electromyographic and biomechanical parameters in protocols of maximum intensity isokinetic knee extension exercises. This architecture allows for limiting the parameter estimates to a specific region of isokinetic exercise, called the isokinetic load range (ILR), where one can consider that the angular velocity is constant and the SEMG signals are cyclo-stationary. Electromyographic signals were acquired using an array of electrodes. CONCLUSION: The results suggest that CV and the other SEMG parameters, including amplitude and frequency descriptors, are sensitive to detect a fatigue process only in protocols that restrict the analysis to ILR and that also bring the subject to a state of fatigue quickly.info:eu-repo/semantics/openAccessSBEB - Sociedade Brasileira de Engenharia BiomédicaRevista Brasileira de Engenharia Biomédica v.30 n.4 20142014-12-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-31512014000400004en10.1590/1517-3151.0528
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libraryname SciELO
language English
format Digital
author Schwartz,Fabiano Peruzzo
Bottaro,Martim
Celes,Rodrigo Souza
Pereira,Maria Claudia
Rocha Júnior,Valdinar de Araújo
Nascimento,Francisco Assis de Oliveira
spellingShingle Schwartz,Fabiano Peruzzo
Bottaro,Martim
Celes,Rodrigo Souza
Pereira,Maria Claudia
Rocha Júnior,Valdinar de Araújo
Nascimento,Francisco Assis de Oliveira
Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators
author_facet Schwartz,Fabiano Peruzzo
Bottaro,Martim
Celes,Rodrigo Souza
Pereira,Maria Claudia
Rocha Júnior,Valdinar de Araújo
Nascimento,Francisco Assis de Oliveira
author_sort Schwartz,Fabiano Peruzzo
title Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators
title_short Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators
title_full Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators
title_fullStr Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators
title_full_unstemmed Study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators
title_sort study of muscle fatigue in isokinetic exercise with estimated conduction velocity and traditional electromyographic indicators
description INTRODUCTION: In the study of human biomechanics, it is often desirable to evaluate fatigue in the muscles that are involved in performing a particular task. Identifying the phenomena responsible for this condition is a problem that in most cases is complex and requires appropriate research mechanisms. Isokinetic dynamometry (ID) and surface electromyography (SEMG) are two techniques widely used in studies on strength and muscle fatigue. Their effectiveness is conditioned upon a good understanding of their limitations and the adoption of procedures to fully exploit the potential of each one. The main goal of the present study is to verify whether the electromyographic parameters, especially the conduction velocity (CV), are sensitive to the fatigue instauration process within sets of maximal isokinetic contractions. CV is a basic physiological parameter directly related to muscle activity and still little explored in experiments combining ID and SEMG. METHODS: Instrumentation architecture that combines ID and SEMG was used to estimate electromyographic and biomechanical parameters in protocols of maximum intensity isokinetic knee extension exercises. This architecture allows for limiting the parameter estimates to a specific region of isokinetic exercise, called the isokinetic load range (ILR), where one can consider that the angular velocity is constant and the SEMG signals are cyclo-stationary. Electromyographic signals were acquired using an array of electrodes. CONCLUSION: The results suggest that CV and the other SEMG parameters, including amplitude and frequency descriptors, are sensitive to detect a fatigue process only in protocols that restrict the analysis to ILR and that also bring the subject to a state of fatigue quickly.
publisher SBEB - Sociedade Brasileira de Engenharia Biomédica
publishDate 2014
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-31512014000400004
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