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dc.contributor.authorLichtwark, G.en_US
dc.contributor.authorBougoulias, K.en_US
dc.contributor.authorWilson, A.en_US
dc.date.accessioned2017-05-03T15:22:07Z
dc.date.available2017-05-03T15:22:07Z
dc.date.issued2007en_US
dc.date.modified2009-11-02T05:19:22Z
dc.identifier.issn00219290en_US
dc.identifier.doi10.1016/j.jbiomech.2005.10.035en_AU
dc.identifier.urihttp://hdl.handle.net/10072/17222
dc.description.abstractUltrasound imaging has recently been used to distinguish the length changes of muscle fascicles from those of the whole muscle tendon complex during real life movements. The complicated three-dimensional architecture of pennate muscles can however cause heterogeneity in the length changes along the length of a muscle. Here we use ultrasonography to examine muscle fascicle length and pennation angle changes at proximal, distal and midbelly sites of the human gastrocnemius medialis (GM) muscle during walking (4.5 km/h) and running (7.5 km/h) on a treadmill. The results of this study have shown that muscle fascicles perform the same actions along the length of the human GM muscle during locomotion. However the distal fascicles tend to shorten more and act at greater pennation angles than the more proximal fascicles. Muscle fascicles acted relatively isometrically during the stance phase during walking, however during running the fascicles shortened throughout the stance phase, which corresponded to an increase in the strain of the series elastic elements (SEEs) (consisting of the Achilles tendon and aponeurosis). Measurement of the fascicle length changes at the midbelly level provided a good approximation of the average fascicle length changes across the length of the muscle. The compliance of the SEE allows the muscle fascicles to shorten at a much slower speed, more concomitant with their optimal speed for maximal power output and efficiency, with high velocity shortening during take off in both walking and running achieved by recoil of the SEE.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent67 bytes
dc.format.extent417365 bytes
dc.format.mimetypetext/plain
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherPergamon Pressen_US
dc.publisher.placeOxford, UKen_US
dc.publisher.urihttp://www.jbiomech.com/homeen_AU
dc.relation.ispartofstudentpublicationNen_AU
dc.relation.ispartofpagefrom157en_US
dc.relation.ispartofpageto164en_US
dc.relation.ispartofissue1en_US
dc.relation.ispartofjournalJournal of Biomechanicsen_US
dc.relation.ispartofvolume40en_US
dc.rights.retentionYen_AU
dc.subject.fieldofresearchcode270604en_US
dc.subject.fieldofresearchcode321402en_US
dc.titleMuscle fascicle and series elastic element length changes along the length of the human gastrocnemius during walking and runningen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 2007 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.en_AU
gro.date.issued2007
gro.hasfulltextFull Text


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