Influence of ankle functional instability on the ankle electromyography during landing after volleyball blocking

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dc.contributor.authorSuda, Eneida Yuri
dc.contributor.authorAmorim, Cesar Ferreira [UNESP]
dc.contributor.authorNeves Sacco, Isabel de Camargo
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionCtr Univ Capital
dc.contributor.institutionUniv Grande ABC
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:33:08Z
dc.date.available2014-05-20T15:33:08Z
dc.date.issued2009-04-01
dc.description.abstractThe purpose of this study was to describe, interpret and compare the EMG activation patterns of ankle muscles - tibialis anterior (TA), peroneus longus (PL) and gastrocnemius lateralis (GL) - in volleyball players with and without ankle functional instability (FI) during landing after the blocking movement. Twenty-one players with FI (IG) and 19 controls (CG) were studied. The cycle of movement analyzed was the time period between 200 ms before and 200 ms after the time of impact determined by ground reaction forces. The variables were analyzed for two different phases: pre-landing (200 ms before impact) and post-landing (200 ms after impact). The RMS values and the timing of onset activity were calculated for the three studied muscles, in both periods and for both groups. The co-activation index for TA and PL, TA and GL were also calculated. Individuals with FI presented a lower RMS value pre-landing for PL (CG = 43.0 perpendicular to 22.0; IG = 26.2 perpendicular to 8.4, p < 0.05) and higher RMS value post-landing (CG = 47.5 perpendicular to 13.3; IG = 55.8 perpendicular to 21.6, p < 0.10). Besides that, in control group PL and GL activated first and simultaneously, and TA presented a later activation, while in subjects with FI all the three muscles activated simultaneously. There were no significant differences between groups for co-activation index. Thus, the rate of contraction between agonist and antagonist muscles is similar for subjects with and without FI but the activation individually was different. Volleyball players with functional instability of the ankle showed altered patterns of the muscles that play an important role in the stabilization of the foot-ankle complex during the performance of the blocking movement, to the detriment of the ligament complex, and this fact could explain the usual complaints in these subjects. (C) 2007 Elsevier Ltd. All rights reserved.en
dc.description.affiliationUniv São Paulo, Lab Biomech Human Movement & Posture Phys Therap, Speech & Occupat Therapy Dept, Sch Med, BR-05360160 São Paulo, Brazil
dc.description.affiliationCtr Univ Capital, Phys Therapy Course, São Paulo, Brazil
dc.description.affiliationUniv Grande ABC, Phys Therapy Dept, Santo Andre, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Engn, Guaratingueta, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Engn, Guaratingueta, SP, Brazil
dc.format.extentE84-E93
dc.identifierhttp://dx.doi.org/10.1016/j.jelekin.2007.10.007
dc.identifier.citationJournal of Electromyography and Kinesiology. Oxford: Elsevier B.V., v. 19, n. 2, p. E84-E93, 2009.
dc.identifier.doi10.1016/j.jelekin.2007.10.007
dc.identifier.issn1050-6411
dc.identifier.urihttp://hdl.handle.net/11449/41850
dc.identifier.wosWOS:000278085100010
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Electromyography and Kinesiology
dc.relation.ispartofjcr1.568
dc.relation.ispartofsjr0,778
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectAnkleen
dc.subjectJoint instabilityen
dc.subjectMotor activityen
dc.subjectElectromyographyen
dc.subjectSportsen
dc.titleInfluence of ankle functional instability on the ankle electromyography during landing after volleyball blockingen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.

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