Reconstruction of the Human Gastrocnemius Force–Length Curve in Vivo: Part 2—Experimental Results

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dc.contributor.author Challis, John H.
dc.contributor.author Winter, Samantha L.
dc.date.accessioned 2009-08-10T07:58:44Z
dc.date.available 2009-08-10T07:58:44Z
dc.date.issued 2008-08-01
dc.identifier.citation Challis , J H & Winter , S L 2008 , ' Reconstruction of the Human Gastrocnemius Force–Length Curve in Vivo: Part 2—Experimental Results ' Journal of Applied Biomechanics , vol 24 , no. 3 , pp. 207-214 . en
dc.identifier.issn 1065-8483
dc.identifier.other PURE: 114782
dc.identifier.other dspace: 2160/2802
dc.identifier.uri http://hdl.handle.net/2160/2802
dc.identifier.uri http://journals.humankinetics.com/jab-back-issues/JABVolume24Issue3August/ReconstructionoftheHumanGastrocnemiusForceLengthCurveinVivoPart2ExperimentalResults en
dc.description Winter, S.L., and Challis, J.H. (2008) Reconstruction of the human gastrocnemius force length curve in vivo: Part 2, experimental results. Journal of Applied Biomechanics, 24(3): 197-206. 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 For a physiologically realistic range of joint motion and therefore range of muscle fiber lengths, only part of the force-length curve can be used in vivo; i.e., the section of the force–length curve that is expressed can vary. The purpose of this study was to determine the expressed section of the force–length relationship of the gastrocnemius for humans. Fourteen male and fourteen female subjects aged 18–27 performed maximal isometric plantar flexions in a Biodex dynamometer. Plantar flexion moments were recorded at five ankle angles: -15°, 0°, 15°, 30°, and 40°, with negative angles defined as dorsiflexion. These measurements were repeated for four randomly ordered knee angles over two testing sessions 4 to 10 days apart. The algorithm of Herzog and ter Keurs (1988a) was used to reconstruct the force–length curves of the biarticular gastrocnemius. Twenty-four subjects operated over the ascending limb, three operated over the descending limb, and one operated over the plateau region. The variation found suggests that large subject groups should be used to determine the extent of normal in vivo variability in this muscle property. The possible source of the variability is discussed in terms of parameters typically used in muscle models. 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 2—Experimental Results 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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