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Location of the motor unit electrical axis and determination of the muscle anisotropy ratio

✍ Scribed by T. Genchev; A. Gydikov; T. Yanev; N. Trayanova

Book ID
104658899
Publisher
Springer-Verlag
Year
1990
Tongue
English
Weight
638 KB
Volume
63
Category
Article
ISSN
0340-1200

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✦ Synopsis

A method to localize the electrical axis of a motor unit (MU) and to simultaneously determine the anisotropy ratio (the ratio between the transverse and the longitudinal extracellular conductivity) of the muscle is proposed. The method is based on the use of Laplace's equation. Particular attention is paid to the theoretical consideration of an asymmetric MU. The method is tested utilizing simulation data on the extracellular potentials of a MU in which the propagation of two depolarized zones along a participant muscle fiber is accounted for. It is shown that the method is reliable and the calculation accurate mostly for the moments of time associated with small changes in the MU potential.

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## Abstract Skeletal muscle is electrically anisotropic, with applied high‐frequency electrical current flowing more easily along than across muscle fibers. As an early step in harnessing this characteristic for clinical use, we studied approaches for maximizing the measured anisotropy by varying e