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Related Experiment Video

Updated: Jul 10, 2026

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies

Published on: January 31, 2013

A nonlinear system model of isometric force.

Joseph P Stitt¹, Karl M Newell

¹Applied Research Laboratory, Pennsylvania State University, University Park, PA 16802, USA. JStitt@psu.edu

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference

|October 20, 2007

Summary

System identification of isometric force in healthy adults reveals that model parameters change with force level. This suggests nonlinear dynamic models are best for analyzing finger force, potentially aiding future neuropathology detection.

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Area of Science:

Neuroscience
Biophysics
System Dynamics

Background:

Isometric force analysis shows promise for early detection of neuropathologies like Parkinson's disease.
Understanding the dynamic system models of human motor control is crucial for identifying subtle physiological differences.

Purpose of the Study:

To estimate parameters of dynamic system models for isometric force exerted by the index finger in healthy young adults.
To investigate if model parameters vary with target force levels.

Main Methods:

Employed system identification techniques to model isometric force production.
Subjects exerted isometric force across a range of 5% to 95% of maximal voluntary contraction.
Estimated coefficients of differential equation models.

Main Results:

Model coefficients were found to be dependent on the target force level.
This dependency indicates a nonlinear relationship in the force exertion dynamics.

Conclusions:

A nonlinear dynamic system model provides a superior fit for isometric force experiments.
These findings establish a baseline for healthy individuals, crucial for future comparisons with neuropathological populations.