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Changes in the flexion relaxation response induced by lumbar muscle fatigue

BACKGROUND: The flexion relaxation phenomenon (FRP) is an interesting model to study the modulation of lumbar stability. Previous investigations have explored the effect of load, angular velocity and posture on this particular response. However, the influence of muscular fatigue on FRP parameters ha...

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Autores principales: Descarreaux, Martin, Lafond, Danik, Jeffrey-Gauthier, Renaud, Centomo, Hugo, Cantin, Vincent
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2259346/
https://www.ncbi.nlm.nih.gov/pubmed/18218087
http://dx.doi.org/10.1186/1471-2474-9-10
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author Descarreaux, Martin
Lafond, Danik
Jeffrey-Gauthier, Renaud
Centomo, Hugo
Cantin, Vincent
author_facet Descarreaux, Martin
Lafond, Danik
Jeffrey-Gauthier, Renaud
Centomo, Hugo
Cantin, Vincent
author_sort Descarreaux, Martin
collection PubMed
description BACKGROUND: The flexion relaxation phenomenon (FRP) is an interesting model to study the modulation of lumbar stability. Previous investigations have explored the effect of load, angular velocity and posture on this particular response. However, the influence of muscular fatigue on FRP parameters has not been thoroughly examined. The objective of the study is to identify the effect of erector spinae (ES) muscle fatigue and spine loading on myoelectric silence onset and cessation in healthy individuals during a flexion-extension task. METHODS: Twenty healthy subjects participated in this study and performed blocks of 3 complete trunk flexions under 4 different experimental conditions: no fatigue/no load (1), no fatigue/load (2), fatigue/no load(3), and fatigue/load (4). Fatigue was induced according to the Sorenson protocol, and electromyographic (EMG) power spectral analysis confirmed that muscular fatigue was adequate in each subject. Trunk and pelvis angles and surface EMG of the ES L2 and L5 were recorded during a flexion-extension task. Trunk flexion angle corresponding to the onset and cessation of myoelectric silence was then compared across the different experimental conditions using 2 × 2 repeated-measures ANOVA. RESULTS: Onset of myoelectric silence during the flexion motion appeared earlier after the fatigue task. Additionally, the cessation of myoelectric silence was observed later during the extension after the fatigue task. Statistical analysis also yielded a main effect of load, indicating a persistence of ES myoelectric activity in flexion during the load condition. CONCLUSION: The results of this study suggest that the presence of fatigue of the ES muscles modifies the FRP. Superficial back muscle fatigue seems to induce a shift in load-sharing towards passive stabilizing structures. The loss of muscle contribution together with or without laxity in the viscoelastic tissues may have a substantial impact on post fatigue stability.
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spelling pubmed-22593462008-03-04 Changes in the flexion relaxation response induced by lumbar muscle fatigue Descarreaux, Martin Lafond, Danik Jeffrey-Gauthier, Renaud Centomo, Hugo Cantin, Vincent BMC Musculoskelet Disord Research Article BACKGROUND: The flexion relaxation phenomenon (FRP) is an interesting model to study the modulation of lumbar stability. Previous investigations have explored the effect of load, angular velocity and posture on this particular response. However, the influence of muscular fatigue on FRP parameters has not been thoroughly examined. The objective of the study is to identify the effect of erector spinae (ES) muscle fatigue and spine loading on myoelectric silence onset and cessation in healthy individuals during a flexion-extension task. METHODS: Twenty healthy subjects participated in this study and performed blocks of 3 complete trunk flexions under 4 different experimental conditions: no fatigue/no load (1), no fatigue/load (2), fatigue/no load(3), and fatigue/load (4). Fatigue was induced according to the Sorenson protocol, and electromyographic (EMG) power spectral analysis confirmed that muscular fatigue was adequate in each subject. Trunk and pelvis angles and surface EMG of the ES L2 and L5 were recorded during a flexion-extension task. Trunk flexion angle corresponding to the onset and cessation of myoelectric silence was then compared across the different experimental conditions using 2 × 2 repeated-measures ANOVA. RESULTS: Onset of myoelectric silence during the flexion motion appeared earlier after the fatigue task. Additionally, the cessation of myoelectric silence was observed later during the extension after the fatigue task. Statistical analysis also yielded a main effect of load, indicating a persistence of ES myoelectric activity in flexion during the load condition. CONCLUSION: The results of this study suggest that the presence of fatigue of the ES muscles modifies the FRP. Superficial back muscle fatigue seems to induce a shift in load-sharing towards passive stabilizing structures. The loss of muscle contribution together with or without laxity in the viscoelastic tissues may have a substantial impact on post fatigue stability. BioMed Central 2008-01-24 /pmc/articles/PMC2259346/ /pubmed/18218087 http://dx.doi.org/10.1186/1471-2474-9-10 Text en Copyright © 2008 Descarreaux et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Descarreaux, Martin
Lafond, Danik
Jeffrey-Gauthier, Renaud
Centomo, Hugo
Cantin, Vincent
Changes in the flexion relaxation response induced by lumbar muscle fatigue
title Changes in the flexion relaxation response induced by lumbar muscle fatigue
title_full Changes in the flexion relaxation response induced by lumbar muscle fatigue
title_fullStr Changes in the flexion relaxation response induced by lumbar muscle fatigue
title_full_unstemmed Changes in the flexion relaxation response induced by lumbar muscle fatigue
title_short Changes in the flexion relaxation response induced by lumbar muscle fatigue
title_sort changes in the flexion relaxation response induced by lumbar muscle fatigue
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2259346/
https://www.ncbi.nlm.nih.gov/pubmed/18218087
http://dx.doi.org/10.1186/1471-2474-9-10
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