Sensitivity of Muscle Force Estimations to Changes in Muscle Input Parameters Using Nonlinear Optimization Approaches

[+] Author and Article Information
Walter Herzog

Human Performance Laboratory, The University of Calgary, Calgary, Alberta, T2N 1N4 Canada

J Biomech Eng 114(2), 267-268 (May 01, 1992) (2 pages) doi:10.1115/1.2891382 History: Received June 13, 1989; Revised September 10, 1991; Online March 17, 2008


The purpose of this study was to analyze the sensitivity of muscle force calculations to changes in muscle input parameters. Force sharing between two synergistic muscles was derived analytically for a one-degree-of-freedom system using three nonlinear optimization approaches. Changes in input parameters that are within normal anatomical variations often caused changes in muscular forces exceeding 100 percent. These results indicate that errors in muscle force calculations may depend as much on inadequate muscle input parameters as they may on the choice of the objective and constraint functions of the optimization approach.

Copyright © 1992 by The American Society of Mechanical Engineers
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