Comparative analysis of modelled extracellular potentials
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A comparative analysis of the features of the extracellular potentials simulated in accordance with three models is give. Considered are the tripole model (TM), the synthetic Gaussian model (SGM) and the model based on the approximation of the transmembrane potential by rectangular waves (RM). In particular, the influence of the duration and of the asymmetry of the transmembrane potential on the shape and parameters of the extracellular potential, simulated in accordance with the SGM and TM at different radial distances is shown. This influence is found to be essentially the same in the case of both these models, even though there are quantitative differences. The results obtained for the SGM and TM are in reasonably good agreement with the data obtained for the RM. Using the spectral characteristics of the SGM and the transfer function of the muscle tissue which follows from the spectral characteristics, an interpretation of the extracellular potential behaviour in the time domain is given. This interpretation leads to an understanding of the mechanism of the radial changes of the extracellular potential shape.
KeywordsAction potentials Electromyography Mathematical model Single fibre
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