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dc.contributor.author Winter, Samantha L.
dc.contributor.author Challis, John H.
dc.date.accessioned 2009-08-10T07:58:58Z
dc.date.available 2009-08-10T07:58:58Z
dc.date.issued 2008-08
dc.identifier.citation Winter , S L & Challis , J H 2008 , ' Reconstruction of the Human Gastrocnemius Force–Length Curve in Vivo: Part 1—Model-Based Validation of Method ' Journal of Applied Biomechanics , vol 24 , no. 3 , pp. 197-206 . en
dc.identifier.issn 1543-2688
dc.identifier.other PURE: 114797
dc.identifier.other dspace: 2160/2803
dc.identifier.uri http://hdl.handle.net/2160/2803
dc.identifier.uri http://es/JABVolume24Issue3August/ReconstructionoftheHumanGastrocnemiusForceLengthCurveinVivoPart1ModelBasedValidationofMethod en
dc.description Winter, S.L., and Challis, J.H. (2008) Reconstruction of the human gastrocnemius force-length curve in vivo: Part 1, model based validation of method. Journal of Applied Biomechanics, 24(3): 207-214. The force-length relationship is a fundamental property of skeletal muscle, however typically only one section of the force-length relationship is used for physiologically realistic joint ranges of motion. This paper validated for the first time a method for determining the section of the force-length curve used by individual subjects for biarticular muscles using a Matlab based muscle model. The individual variation in the section of the force-length relationship used is important for understanding differences between normal and pathological movement, and for the modelling of muscle-tendon complexes. en
dc.description.abstract The muscle fiber force–length relationship has been explained in terms of the cross-bridge theory at the sarcomere level. In vivo, for a physiologically realistic range of joint motion, and therefore range of muscle fiber lengths, only part of the force–length curve may be used; that is, the section of the force–length curve expressed can vary. The purpose of this study was to assess the accuracy of a method for determining the expressed section of the force–length curve for biarticular muscles. A muscle model was used to simulate the triceps surae muscle group. Three model formulations were used so that the gastrocnemius operated over different portions of the force–length curve: the ascending limb, the plateau region, and the descending limb. Joint moment data were generated for a range of joint configurations and from this simulated data the region of the force– length relationship that the gastrocnemius muscle operated over was successfully reconstructed using the algorithm of Herzog and ter Keurs (1988a). Further simulations showed that the correct region of the force–length curve was accurately reconstructed even in the presence of random and systematic noise generated to reflect the effects of sampling errors, and incomplete muscle activation. en
dc.format.extent 8 en
dc.language.iso eng
dc.relation.ispartof Journal of Applied Biomechanics en
dc.title Reconstruction of the Human Gastrocnemius Force–Length Curve in Vivo: Part 1—Model-Based Validation of Method en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Department of Sport & Exercise Science en
dc.description.status Peer reviewed en


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