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dc.contributor.authorWerkhausen, Amelie Corinna
dc.contributor.authorCronin, Neil J.
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.accessioned2020-05-05T09:35:37Z
dc.date.available2020-05-05T09:35:37Z
dc.date.created2019-10-18T08:14:05Z
dc.date.issued2019
dc.identifier.citationPeerJ. 2019, 2019 7, e6764.en_US
dc.identifier.issn2167-8359
dc.identifier.urihttps://hdl.handle.net/11250/2653304
dc.descriptionDistributed under Creative Commons CC-BY 4.0.en_US
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.en_US
dc.language.isoengen_US
dc.subjectachilles tendonen_US
dc.subjectstiffnessen_US
dc.subjectrunningen_US
dc.subjecttendon propertiesen_US
dc.subjectarchitectural gear ratioen_US
dc.subjectgastrocnemiusen_US
dc.subjectsoleusen_US
dc.titleTraining-induced increase in Achilles tendon stiffness affects tendon strain pattern during runningen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© 2019 Werkhausen et al.en_US
dc.source.pagenumber18en_US
dc.source.volume2019en_US
dc.source.journalPeerJen_US
dc.source.issue4en_US
dc.identifier.doi10.7717/peerj.6764
dc.identifier.cristin1738221
dc.description.localcodeSeksjon for fysisk prestasjonsevne / Department of Physical Performanceen_US
cristin.unitcode150,31,0,0
cristin.unitnameSeksjon for fysisk prestasjonsevne
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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