Abstract
The electrical impedance myography method is widely used in solving bionic control problems and consists of assessing the change in the electrical impedance magnitude during muscle contraction in real time. However, the choice of electrode systems sizes is not always properly considered when using the electrical impedance myography method in the existing approaches, which is important in terms of electrical impedance signal expressiveness and reproducibility. The article is devoted to the determination of acceptable sizes for the electrode systems for electrical impedance myography using the Pareto optimality assessment method and the electrical impedance signals formation model of the forearm area, taking into account the change in the electrophysical and geometric parameters of the skin and fat layer and muscle groups when performing actions with a hand. Numerical finite element simulation using anthropometric models of the forearm obtained by volunteers’ MRI 3D reconstructions was performed to determine a sufficient degree of the forearm anatomical features detailing in terms of the measured electrical impedance. For the mathematical description of electrical impedance relationships, a forearm two-layer model, represented by the skin-fat layer and muscles, was reasonably chosen, which adequately describes the change in electrical impedance when performing hand actions. Using this model, for the first time, an approach that can be used to determine the acceptable sizes of electrode systems for different parts of the body individually was proposed.
Highlights
Introduction1. Introduction with regard to jurisdictional claims in Determining the type and parameters of the performed action is a device control systems key issue, which is based on bionic control
An important task in the control systems for technical devices based on electrical impedance (EI) design is to determine the ES geometric parameters
A method for determining the acceptable ES size for forearm muscle activity EI measurements using the method for assessing Pareto optimality according to criteria considering the skin-fat layer individual parameters is proposed for the first time
Summary
1. Introduction with regard to jurisdictional claims in Determining the type and parameters of the performed action is a device control systems key issue, which is based on bionic control. Introduction with regard to jurisdictional claims in Determining the type and parameters of the performed action is a device control systems key issue, which is based on bionic control Such devices can be both medical devices (bioelectric prostheses, orthoses, exoskeletons, rehabilitation, surgical devices) and special-purpose devices. Development is the definition of methods and biophysical principles for obtaining information about the performed movement, which should allow the determination of its type and to carry out a numerical assessment of the movement force-torque characteristics [1,5].
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