Influence of the Parameters of a Human Triceps Surae Muscle Model on the Isometric Torque-Angle Relationship

[+] Author and Article Information
Lia Out, Tanja G. M. Vrijkotte, Arthur J. van Soest, Maarten F. Bobbert

Department of Functional Anatomy, Vrije Universiteit Amsterdam, The Netherlands

J Biomech Eng 118(1), 17-25 (Feb 01, 1996) (9 pages) doi:10.1115/1.2795940 History: Received December 17, 1991; Revised January 21, 1995; Online October 30, 2007


This study investigates the influence of parameter values of the human triceps surae muscle on the torque-angle relationship. The model used consisted of three units, each containing a contractile, a series elastic and a parallel elastic element. Parameter values were based on morphological characteristics, which made it possible to model individual units. However, for a number of parameters the values reported in the literature vary considerably. It was investigated how sensitive model results were for variation of these parameters. Slack length of the series elastic element, mean moment arm, maximum force, and length of the contractile element appeared to be the most important determinants of the behavior. For mean moment arm and contractile element length, morphology-based methods of estimation could be recommended. Slack length and maximum force were obtained through optimization. It was concluded that the model does not contain parameters on which its output depends strongly and which are difficult to estimate as well, with two exceptions: slack length of the series elastic element and maximum force.

Copyright © 1996 by The American Society of Mechanical Engineers
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