Deformation and three-dimensional displacement of fibers in isometrically contracting rat plantaris muscles.

H.H.C.M. Savelberg, P.J.B. Willems, G.C. Baan, P.A. Huijing

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Abstract

J Morphol 2001 Oct;250(1):89-99 Related Articles, Books, LinkOut


Deformation and three-dimensional displacement of fibers in isometrically contracting rat plantaris muscles.

Savelberg HH, Willems PJ, Baan GC, Huijing PA.

Department of Human Movement Sciences, Faculty of Health Science, Maastricht University, Maastricht, The Netherlands. hans.savelberg@bw.unimaas.nl

In this study, the deformation of different fibers of the rat m. plantaris during "isometric" contractions at different muscle lengths was considered. Because the m. plantaris has an obviously inhomogeneous architecture, its fibers on the medial side of the muscle belly are judged to be shorter than those on the lateral side of it. It was expected that longitudinal deformation of different fibers would vary accordingly. A 3D video analysis of contracting muscle showed that longitudinal strain of fibers as a function of muscle length does not differ between fibers on different sides of the muscle. Apart from longitudinal shortening, the fibers were also displaced laterally during a contraction. The fibers displaced during a contraction in a direction perpendicular to their longitudinal axis. The displacement of the fibers occurred asymmetrically, resulting in a helical deformation of the whole muscle. It is concluded that the asymmetric displacement and the helical deformation must result from transversal forces between the fibers. It is hypothesized that these transversal forces cancel out differences in longitudinal strains that might exist between fibers. Copyright 2001 Wiley-Liss, Inc.

Original languageEnglish
Pages (from-to)89-99
Number of pages11
JournalJournal of Morphology
Volume250
Issue number1
DOIs
Publication statusPublished - 1 Jan 2001

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