Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force

Introduction Spectral frequencies of the surface electromyogram (sEMG) increase with contraction force, but debate still exists on whether this increase is affected by various methodological and anatomical factors. This study aimed to investigate the influence of inter-electrode distance (IED) and c...

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Autores: Rodríguez Falces, Javier, Neyroud, Daria, Place, Nicolas
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2014
País:España
Recursos:Universidad Pública de Navarra
Repositorio:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
OAI Identifier:oai:academica-e.unavarra.es:2454/55584
Acesso em linha:https://hdl.handle.net/2454/55584
Access Level:acceso abierto
Palavra-chave:Power spectral analysis
Median frequency
Ramp contractions
Step-wise contractions
Inter-electrode distance
Fibre-type distribution
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spelling Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction forceRodríguez Falces, JavierNeyroud, DariaPlace, NicolasPower spectral analysisMedian frequencyRamp contractionsStep-wise contractionsInter-electrode distanceFibre-type distributionIntroduction Spectral frequencies of the surface electromyogram (sEMG) increase with contraction force, but debate still exists on whether this increase is affected by various methodological and anatomical factors. This study aimed to investigate the influence of inter-electrode distance (IED) and contraction modality (step-wise vs. ramp) on the changes in spectral frequencies with increasing contraction strength for the vastus lateralis (VL) and vastus medialis (VM) muscles. Methods Twenty healthy male volunteers were assessed for isometric sEMG activity of the VM and VL, with the knee at 90° flexion. Subjects performed isometric ramp contractions in knee extension (6-s duration) with the force gradually increasing from 0 to 80 % MVC. Also, subjects performed 4-s step-wise isometric contractions at 10, 20, 30, 40, 50, 60, 70, and 80 % MVC. Interference sEMG signals were recorded simultaneously at different IEDs: 10, 20, 30, and 50 mm. The mean (Fmean) and median (Fmedian) frequencies and root mean square (RMS) of sEMG signals were calculated. Results For all IEDs, contraction modalities, and muscles tested, spectral frequencies increased significantly with increasing level of force up to 50–60 % MVC force. Spectral indexes increased systematically as IED was decreased. The sensitivity of spectral frequencies to changes in contraction force was independent of IED. The behaviour of spectral indexes with increasing contraction force was similar for step-wise and ramp contractions. Conclusions In the VL and VM muscles, it is highly unlikely that a particular inter-electrode distance or contraction modality could have prevented the observation of the full extent of the increase in spectral frequencies with increasing force level.SpringerIngeniería Eléctrica y ElectrónicaIngeniaritza Elektrikoa eta Elektronikoa2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2454/55584reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarrainstname:Universidad Pública de NavarraInglés© Springer-Verlag Berlin Heidelberg 2014.info:eu-repo/semantics/openAccessoai:academica-e.unavarra.es:2454/555842026-06-17T12:41:47Z
dc.title.none.fl_str_mv Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force
title Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force
spellingShingle Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force
Rodríguez Falces, Javier
Power spectral analysis
Median frequency
Ramp contractions
Step-wise contractions
Inter-electrode distance
Fibre-type distribution
title_short Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force
title_full Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force
title_fullStr Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force
title_full_unstemmed Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force
title_sort Influence of inter-electrode distance, contraction type, and muscle on the relationship between the sEMG power spectrum and contraction force
dc.creator.none.fl_str_mv Rodríguez Falces, Javier
Neyroud, Daria
Place, Nicolas
author Rodríguez Falces, Javier
author_facet Rodríguez Falces, Javier
Neyroud, Daria
Place, Nicolas
author_role author
author2 Neyroud, Daria
Place, Nicolas
author2_role author
author
dc.contributor.none.fl_str_mv Ingeniería Eléctrica y Electrónica
Ingeniaritza Elektrikoa eta Elektronikoa
dc.subject.none.fl_str_mv Power spectral analysis
Median frequency
Ramp contractions
Step-wise contractions
Inter-electrode distance
Fibre-type distribution
topic Power spectral analysis
Median frequency
Ramp contractions
Step-wise contractions
Inter-electrode distance
Fibre-type distribution
description Introduction Spectral frequencies of the surface electromyogram (sEMG) increase with contraction force, but debate still exists on whether this increase is affected by various methodological and anatomical factors. This study aimed to investigate the influence of inter-electrode distance (IED) and contraction modality (step-wise vs. ramp) on the changes in spectral frequencies with increasing contraction strength for the vastus lateralis (VL) and vastus medialis (VM) muscles. Methods Twenty healthy male volunteers were assessed for isometric sEMG activity of the VM and VL, with the knee at 90° flexion. Subjects performed isometric ramp contractions in knee extension (6-s duration) with the force gradually increasing from 0 to 80 % MVC. Also, subjects performed 4-s step-wise isometric contractions at 10, 20, 30, 40, 50, 60, 70, and 80 % MVC. Interference sEMG signals were recorded simultaneously at different IEDs: 10, 20, 30, and 50 mm. The mean (Fmean) and median (Fmedian) frequencies and root mean square (RMS) of sEMG signals were calculated. Results For all IEDs, contraction modalities, and muscles tested, spectral frequencies increased significantly with increasing level of force up to 50–60 % MVC force. Spectral indexes increased systematically as IED was decreased. The sensitivity of spectral frequencies to changes in contraction force was independent of IED. The behaviour of spectral indexes with increasing contraction force was similar for step-wise and ramp contractions. Conclusions In the VL and VM muscles, it is highly unlikely that a particular inter-electrode distance or contraction modality could have prevented the observation of the full extent of the increase in spectral frequencies with increasing force level.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2454/55584
url https://hdl.handle.net/2454/55584
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv © Springer-Verlag Berlin Heidelberg 2014.
info:eu-repo/semantics/openAccess
rights_invalid_str_mv © Springer-Verlag Berlin Heidelberg 2014.
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
instname:Universidad Pública de Navarra
instname_str Universidad Pública de Navarra
reponame_str Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
collection Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
repository.name.fl_str_mv
repository.mail.fl_str_mv
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