Low-frequency fatigue at maximal and submaximal muscle contractions
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/30517 |
Resumo: | Skeletal muscle force production following repetitive contractions is preferentially reduced when muscle is evaluated with lowfrequency stimulation. This selective impairment in force generation is called low-frequency fatigue (LFF) and could be dependent on the contraction type. The purpose of this study was to compare LFF after concentric and eccentric maximal and submaximal contractions of knee extensor muscles. Ten healthy male subjects (age: 23.6 ± 4.2 years; weight: 73.8 ± 7.7 kg; height: 1.79 ± 0.05 m) executed maximal voluntary contractions that were measured before a fatigue test (pre-exercise), immediately after (after-exercise) and after 1 h of recovery (after-recovery). The fatigue test consisted of 60 maximal (100%) or submaximal (40%) dynamic concentric or eccentric knee extensions at an angular velocity of 60°/s. The isometric torque produced by low- (20 Hz) and high- (100 Hz) frequency stimulation was also measured at these times and the 20:100 Hz ratio was calculated to assess LFF. One-way ANOVA for repeated measures followed by the Newman-Keuls post hoc test was used to determine significant (P < 0.05) differences. LFF was evident after-recovery in all trials except following submaximal eccentric contractions. LFF was not evident after-exercise, regardless of exercise intensity or contraction type. Our results suggest that low-frequency fatigue was evident after submaximal concentric but not submaximal eccentric contractions and was more pronounced after 1-h of recovery. |
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Baptista, Rafael ReimannVaz, Marco Aurelio2011-08-04T06:01:04Z20090100-879Xhttp://hdl.handle.net/10183/30517000758629Skeletal muscle force production following repetitive contractions is preferentially reduced when muscle is evaluated with lowfrequency stimulation. This selective impairment in force generation is called low-frequency fatigue (LFF) and could be dependent on the contraction type. The purpose of this study was to compare LFF after concentric and eccentric maximal and submaximal contractions of knee extensor muscles. Ten healthy male subjects (age: 23.6 ± 4.2 years; weight: 73.8 ± 7.7 kg; height: 1.79 ± 0.05 m) executed maximal voluntary contractions that were measured before a fatigue test (pre-exercise), immediately after (after-exercise) and after 1 h of recovery (after-recovery). The fatigue test consisted of 60 maximal (100%) or submaximal (40%) dynamic concentric or eccentric knee extensions at an angular velocity of 60°/s. The isometric torque produced by low- (20 Hz) and high- (100 Hz) frequency stimulation was also measured at these times and the 20:100 Hz ratio was calculated to assess LFF. One-way ANOVA for repeated measures followed by the Newman-Keuls post hoc test was used to determine significant (P < 0.05) differences. LFF was evident after-recovery in all trials except following submaximal eccentric contractions. LFF was not evident after-exercise, regardless of exercise intensity or contraction type. Our results suggest that low-frequency fatigue was evident after submaximal concentric but not submaximal eccentric contractions and was more pronounced after 1-h of recovery.application/pdfengBrazilian journal of medical and biological research = Revista brasileira de pesquisas médicas e biológicas. Vol. 42, n. 4 (2009), p. 380-385EletromiografiaBiomecânicaMúsculosEccentric contractionsConcentric contractionsKnee extensor torqueElectrical stimulationLow-frequency fatigue at maximal and submaximal muscle contractionsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT000758629.pdf.txt000758629.pdf.txtExtracted Texttext/plain25478http://www.lume.ufrgs.br/bitstream/10183/30517/2/000758629.pdf.txtfdea4487b28d1b04801b526906959454MD52ORIGINAL000758629.pdf000758629.pdfTexto completo (inglês)application/pdf77251http://www.lume.ufrgs.br/bitstream/10183/30517/1/000758629.pdf64c4547bccae7976b23a07d2a229969aMD51THUMBNAIL000758629.pdf.jpg000758629.pdf.jpgGenerated Thumbnailimage/jpeg2090http://www.lume.ufrgs.br/bitstream/10183/30517/3/000758629.pdf.jpg33573bfd219730468968d57f8a745a2cMD5310183/305172018-10-09 09:29:09.326oai:www.lume.ufrgs.br:10183/30517Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2018-10-09T12:29:09Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Low-frequency fatigue at maximal and submaximal muscle contractions |
title |
Low-frequency fatigue at maximal and submaximal muscle contractions |
spellingShingle |
Low-frequency fatigue at maximal and submaximal muscle contractions Baptista, Rafael Reimann Eletromiografia Biomecânica Músculos Eccentric contractions Concentric contractions Knee extensor torque Electrical stimulation |
title_short |
Low-frequency fatigue at maximal and submaximal muscle contractions |
title_full |
Low-frequency fatigue at maximal and submaximal muscle contractions |
title_fullStr |
Low-frequency fatigue at maximal and submaximal muscle contractions |
title_full_unstemmed |
Low-frequency fatigue at maximal and submaximal muscle contractions |
title_sort |
Low-frequency fatigue at maximal and submaximal muscle contractions |
author |
Baptista, Rafael Reimann |
author_facet |
Baptista, Rafael Reimann Vaz, Marco Aurelio |
author_role |
author |
author2 |
Vaz, Marco Aurelio |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Baptista, Rafael Reimann Vaz, Marco Aurelio |
dc.subject.por.fl_str_mv |
Eletromiografia Biomecânica Músculos |
topic |
Eletromiografia Biomecânica Músculos Eccentric contractions Concentric contractions Knee extensor torque Electrical stimulation |
dc.subject.eng.fl_str_mv |
Eccentric contractions Concentric contractions Knee extensor torque Electrical stimulation |
description |
Skeletal muscle force production following repetitive contractions is preferentially reduced when muscle is evaluated with lowfrequency stimulation. This selective impairment in force generation is called low-frequency fatigue (LFF) and could be dependent on the contraction type. The purpose of this study was to compare LFF after concentric and eccentric maximal and submaximal contractions of knee extensor muscles. Ten healthy male subjects (age: 23.6 ± 4.2 years; weight: 73.8 ± 7.7 kg; height: 1.79 ± 0.05 m) executed maximal voluntary contractions that were measured before a fatigue test (pre-exercise), immediately after (after-exercise) and after 1 h of recovery (after-recovery). The fatigue test consisted of 60 maximal (100%) or submaximal (40%) dynamic concentric or eccentric knee extensions at an angular velocity of 60°/s. The isometric torque produced by low- (20 Hz) and high- (100 Hz) frequency stimulation was also measured at these times and the 20:100 Hz ratio was calculated to assess LFF. One-way ANOVA for repeated measures followed by the Newman-Keuls post hoc test was used to determine significant (P < 0.05) differences. LFF was evident after-recovery in all trials except following submaximal eccentric contractions. LFF was not evident after-exercise, regardless of exercise intensity or contraction type. Our results suggest that low-frequency fatigue was evident after submaximal concentric but not submaximal eccentric contractions and was more pronounced after 1-h of recovery. |
publishDate |
2009 |
dc.date.issued.fl_str_mv |
2009 |
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2011-08-04T06:01:04Z |
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0100-879X |
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eng |
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eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Brazilian journal of medical and biological research = Revista brasileira de pesquisas médicas e biológicas. Vol. 42, n. 4 (2009), p. 380-385 |
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