Abstract
A modified line source model presented earlier has been used to study the decline of the extracellular single muscle fibre action potential. The muscle tissue is modelled as a low-pass filter. The transfer function of the filter declines more slowly than a first order low-pass filter at low frequencies, but much faster at high frequencies. The cutoff frequency of the filter increases when the anisotropy of the muscle decreases. It also increases proportionally with the propagation velocity of the action potential. The decline of different frequency components obtained from the modified line source volume conductor and a filter model derived from experimental measurements are compared and their differences explained. The modified line source model was found to be identical to the volume conductor model in terms of results and at the same time conceptually simple for applications.
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Nandedkar, S.D., Sigl, J.C., Kim, Y.I. et al. Radial decline of the extracellular action potential. Med. Biol. Eng. Comput. 22, 564–568 (1984). https://doi.org/10.1007/BF02443871
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DOI: https://doi.org/10.1007/BF02443871