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Passive muscle length changes affect twitch potentiation in power athletes

2014-07Journal article Open access
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dc.contributor.authorGago, Paulo
dc.contributor.authorMarques, Mário Cardoso
dc.contributor.authorMarinho, Daniel
dc.contributor.authorEkblom, Maria
dc.date.accessioned2020-02-20T10:08:18Z
dc.date.available2020-02-20T10:08:18Z
dc.date.issued2014-07
dc.description.abstractA conditioning maximal voluntary muscle action (MVC) has been shown to induce postactivation potentiation, that is, improved contractile muscle properties, when muscles are contracted isometrically. It is still uncertain how the contractile properties are affected during ongoing muscle length changes. The purpose of this study was to investigate the effects of a 6-s conditioning MVC on twitch properties of the plantarflexors during ongoing muscle length changes. Peak twitch, rate of torque development, and rate of torque relaxation, rising time, and half relaxation time were measured from supramaximal twitches evoked in the plantarflexors of 11 highly trained athletes. Twitches were evoked before a 6-s MVC and subsequently on eight different occasions during a 10-min recovery for five different modes: fast lengthening, slow lengthening, isometric, fast shortening, and slow shortening of the plantarflexors. The magnitude and the duration of effects from the conditioning MVC were significantly different between modes. Peak twitch, rate of torque development, and rate of torque relaxation significantly increased for all modes but more so for twitches evoked during fast and slow shortening as compared with lengthening. Rising time was reduced in the lengthening modes but slightly prolonged in the shortening modes. Half relaxation time was significantly reduced for all modes, except fast lengthening. The findings show that the effects of a conditioning MVC on twitch contractile properties are dependent on direction and velocity of ongoing muscle length changes. This may imply that functional enhancements from a conditioning MVC might be expected to be greatest for concentric muscle actions but are still present in isometric and eccentric parts of a movement.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1249/MSS.0000000000000245pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.6/9410
dc.language.isoengpt_PT
dc.relationMÉTODOS DE POTENCIAÇÃO E RECUPERAÇÃO MUSCULAR EM ATLETAS DE ALTO RENDIMENTO, SOBRE DIFERENTES DESEMPENHOS MOTORES
dc.subjectAdultpt_PT
dc.subjectAnklept_PT
dc.subjectElectric Stimulationpt_PT
dc.subjectElectromyographypt_PT
dc.subjectHumanspt_PT
dc.subjectIsometric Contractionpt_PT
dc.subjectMalept_PT
dc.subjectMuscle Contractionpt_PT
dc.subjectMuscle Relaxationpt_PT
dc.subjectMuscle, Skeletalpt_PT
dc.subjectSportspt_PT
dc.subjectTorquept_PT
dc.subjectYoung Adultpt_PT
dc.titlePassive muscle length changes affect twitch potentiation in power athletespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMÉTODOS DE POTENCIAÇÃO E RECUPERAÇÃO MUSCULAR EM ATLETAS DE ALTO RENDIMENTO, SOBRE DIFERENTES DESEMPENHOS MOTORES
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F79184%2F2011/PT
oaire.citation.endPage1342pt_PT
oaire.citation.issue7pt_PT
oaire.citation.startPage1334pt_PT
oaire.citation.titleMedicine and Science in Sports and Exercisept_PT
oaire.citation.volume46pt_PT
person.familyNameGago
person.familyNameMARQUES
person.familyNameMarinho
person.familyNameEkblom
person.givenNamePaulo
person.givenNameMÁRIO
person.givenNameDaniel
person.givenNameMaria
person.identifier.ciencia-idEA13-7532-0A6D
person.identifier.ciencia-id471B-F3CC-479A
person.identifier.orcid0000-0002-8580-6518
person.identifier.orcid0000-0002-5812-1580
person.identifier.orcid0000-0003-2351-3047
person.identifier.orcid0000-0002-7879-9188
person.identifier.scopus-author-id24773599000
person.identifier.scopus-author-id15022568500
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublicationd9cbb4c0-088b-40e2-9493-388dbba693df
relation.isAuthorOfPublication.latestForDiscovery22799987-25fa-4139-8e07-0d1626ee1b8f
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