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Published on: August 12, 2018
Transient finite element modeling of functional electrical stimulation.
Nenad D Filipovic1, Aleksandar S Peulic, Nebojsa D Zdravkovic
1Faculty of Mechanical Engineering, University of Kragujevac, S. Janjic 6, 34 000 Kragujevac, Serbia. fica@kg.ac.rs
General Physiology and Biophysics
|April 5, 2011
Summary
This study presents a finite element model for transient electrical stimulation of forearm muscles. The model accurately predicts current distribution, aiding in understanding muscle strengthening effects.
Area of Science:
- Biomedical Engineering
- Computational Electrophysiology
- Musculoskeletal Rehabilitation
Background:
- Transcutaneous functional electrical stimulation (FES) is widely used for muscle strengthening.
- Transient effects of FES, particularly concerning pulse duration, are not fully understood.
- Existing static models do not capture the dynamic behavior of electrical stimulation.
Purpose of the Study:
- To develop and validate a finite element (FE) model for transient electrical stimulation of the forearm.
- To investigate the spatial-temporal distribution of electrical current during FES.
- To refine tissue conductive and dielectric properties using experimental data.
Main Methods:
- Developed a discrete FE model using the Galerkin procedure.
- Fitted tissue properties by comparing model predictions with experimental measurements (least squares, trial and error).
- Modeled three different current pulse inputs on the same forearm geometry.
Main Results:
- The FE model successfully provided spatial-temporal current distribution in the forearm.
- Transient FE analysis allowed for fitting of tissue properties.
- Model predictions were validated against experimental intramuscular voltage measurements in a volunteer.
Conclusions:
- FE modeling is a viable tool for analyzing transient electrical stimulation.
- The model aids in understanding current flow dynamics during FES.
- Accurate modeling can improve the efficacy of FES for muscle strengthening.

