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dc.contributor.authorWerkhausen, Amelie
dc.contributor.authorCronin, Neil
dc.contributor.authorAlbracht, Kirsten
dc.contributor.authorPaulsen, Gøran
dc.contributor.authorLarsen, Askild V.
dc.contributor.authorBojsen-Møller, Jens
dc.contributor.authorSeynnes, Olivier R.
dc.date.accessioned2019-04-29T11:09:29Z
dc.date.available2019-04-29T11:09:29Z
dc.date.issued2019
dc.identifier.citationWerkhausen, A., Cronin, N., Albracht, K., Paulsen, G., Larsen, A. V., Bojsen-Møller, J., & Seynnes, O. R. (2019). Training-induced increase in Achilles tendon stiffness affects tendon strain pattern during running. <i>PeerJ</i>, <i>2019</i>(7), Article e6764. <a href="https://doi.org/10.7717/peerj.6764" target="_blank">https://doi.org/10.7717/peerj.6764</a>
dc.identifier.otherCONVID_30540635
dc.identifier.otherTUTKAID_81285
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/63652
dc.description.abstractBackground: During the stance phase of running, the elasticity of the Achilles tendon enables the utilisation of elastic energy and allows beneficial contractile conditions for the triceps surae muscles. However, the effect of changes in tendon mechanical properties induced by chronic loading is still poorly understood. We tested the hypothesis that a training-induced increase in Achilles tendon stiffness would result in reduced tendon strain during the stance phase of running, which would reduce fascicle strains in the triceps surae muscles, particularly in the mono-articular soleus. Methods: Eleven subjects were assigned to a training group performing isometric single-leg plantarflexion contractions three times per week for ten weeks, and another ten subjects formed a control group. Before and after the training period, Achilles tendon stiffness was estimated, and muscle-tendon mechanics were assessed during running at preferred speed using ultrasonography, kinematics and kinetics. Results: Achilles tendon stiffness increased by 18% (P < 0.01) in the training group, but the associated reduction in strain seen during isometric contractions was not statistically significant. Tendon elongation during the stance phase of running was similar after training, but tendon recoil was reduced by 30% (P < 0.01), while estimated tendon force remained unchanged. Neither gastrocnemius medialis nor soleus fascicle shortening during stance was affected by training. Discussion: These results show that a training-induced increase in Achilles tendon stiffness altered tendon behaviour during running. Despite training-induced changes in tendon mechanical properties and recoil behaviour, the data suggest that fascicle shortening patterns were preserved for the running speed that we examined. The asymmetrical changes in tendon strain patterns supports the notion that simple in-series models do not fully explain the mechanical output of the muscle-tendon unit during a complex task like running.fi
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherPeerJ, Ltd.
dc.relation.ispartofseriesPeerJ
dc.rightsCC BY 4.0
dc.subject.otherachilles tendon
dc.subject.othertendon properties
dc.subject.otherarchitectural gear ratio
dc.subject.othergastrocnemius
dc.subject.othersoleus
dc.titleTraining-induced increase in Achilles tendon stiffness affects tendon strain pattern during running
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201904252283
dc.contributor.laitosLiikuntatieteellinen tiedekuntafi
dc.contributor.laitosFaculty of Sport and Health Sciencesen
dc.contributor.oppiaineBiomekaniikkafi
dc.contributor.oppiaineBiomechanicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2019-04-25T12:15:06Z
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.relation.issn2167-8359
dc.relation.numberinseries7
dc.relation.volume2019
dc.type.versionpublishedVersion
dc.rights.copyright© 2019 Werkhausen et al.
dc.rights.accesslevelopenAccessfi
dc.subject.ysokantajänne
dc.subject.ysojäykkyys
dc.subject.ysojuoksu
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p18959
jyx.subject.urihttp://www.yso.fi/onto/yso/p20176
jyx.subject.urihttp://www.yso.fi/onto/yso/p9087
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.7717/peerj.6764
dc.type.okmA1


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