Recording from a Single Motor Unit During Strong Effort

Steen Andreassen, Annelise Rosenfalck

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During strong voluntary effort it is rarely possible to identify the action potentials from single motor units. In large muscles the most selective recordings are obtained with bipolar wire electrodes. To elucidate this experimental finding we have calculated the extracellular field around a single muscle fiber from an intracellular muscle action potential. This model showed that the selectivity of a bipolar electrode is high provided: i) the diameter of the recording surfaces is less than half the diameter of the muscle fibers; ii) the center distance between the recording surfaces is of the same order or smaller than the diameter of the muscle fibers, and when iii) the center-line between the recording surfaces is oriented perpendicular to the direction of the muscle fibers.
Original languageEnglish
JournalI E E E Transactions on Biomedical Engineering
Issue number6
Pages (from-to)501-508
Publication statusPublished - 1978

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