Moderate intensity and volume downhill run does not impair knee joint stability at early and late phases of quadriceps/hamstrings contraction

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dc.contributor.authorAssumpcao, Claudio de Oliveira [UNESP]
dc.contributor.authorRabello de Lima, Leonardo Coelho [UNESP]
dc.contributor.authorDias de Oliveira, Felipe Bruno [UNESP]
dc.contributor.authorGreco, Camila Coelho [UNESP]
dc.contributor.authorDenadai, Benedito Sergio [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-03-18T15:56:20Z
dc.date.available2015-03-18T15:56:20Z
dc.date.issued2014-01-01
dc.description.abstractBACKGROUND AND OBJECTIVE: Muscle strength imbalance can be an important factor in hamstrings muscle strain. The main purpose of this study was to investigate the effects of downhill running on hamstrings/quadriceps torque (H/Q(torque)) and the electromechanical delay (H/Q(EMD)) ratios.METHODS: Fifteen active male individuals performed two maximal voluntary isometric contractions of the knee extensors and knee flexors, from which the maximal muscle torque, EMD and H/Q(torque) and H/Q(EMD) ratios were extracted. Thereafter, the participants performed a 30-minute downhill run (-16%) at 70% VO(2)max. Dependent variables were assessed immediately before, immediately following and 48 hours after the effort.RESULTS: Maximal isometric torque decreased significantly immediately after the downhill run for both the extensors (pre: 271.8 +/- 45.9 N.m; post: 235.5 +/- 55.7 N.m) and flexors (pre: 112.2 +/- 26.3 N.m; post: 97.7 +/- 27.2 N.m). No significant difference was identified over time for the EMD of the vastus lateralis and biceps femoris muscles. The H/Q(torque) and H/Q(EMD) ratios were not influenced by the downhill run.CONCLUSION: We have demonstrated that moderate intensity and volume downhill run does not impair knee joint stability at early (H/Q(EMD)) and late phases (H/Q(torque)) of quadriceps/hamstrings contraction.en
dc.description.affiliationUNESP, Human Performance Lab, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUnespUNESP, Human Performance Lab, BR-13506900 Rio Claro, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent311-317
dc.identifierhttp://dx.doi.org/10.3233/IES-140553
dc.identifier.citationIsokinetics And Exercise Science. Amsterdam: Ios Press, v. 22, n. 4, p. 311-317, 2014.
dc.identifier.doi10.3233/IES-140553
dc.identifier.issn0959-3020
dc.identifier.lattes7416129894680689
dc.identifier.lattes1907479250833033
dc.identifier.urihttp://hdl.handle.net/11449/117498
dc.identifier.wosWOS:000344728100007
dc.language.isoeng
dc.publisherIos Press
dc.relation.ispartofIsokinetics And Exercise Science
dc.relation.ispartofjcr0.568
dc.relation.ispartofsjr0,222
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectStrengthen
dc.subjectfatigueen
dc.subjectmuscle damageen
dc.titleModerate intensity and volume downhill run does not impair knee joint stability at early and late phases of quadriceps/hamstrings contractionen
dc.typeArtigo
dcterms.licensehttp://www.iospress.nl/service/authors/author-copyright-agreement/
dcterms.rightsHolderIos Press
unesp.author.lattes7416129894680689[4]
unesp.author.lattes1907479250833033[5]
unesp.author.orcid0000-0003-4118-534X[2]
unesp.author.orcid0000-0003-0775-1889[5]
unesp.author.orcid0000-0003-1226-5041[1]
unesp.author.orcid0000-0002-7611-9759[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Rio Claropt

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