Jitter of the stimulated motor axon
- 1 April 1992
- journal article
- research article
- Published by Wiley in Muscle & Nerve
- Vol. 15 (4), 449-454
- https://doi.org/10.1002/mus.880150405
Abstract
Electrical microstimulation of motor axons in conjunction with single fiber EMG (SFEMG) is increasingly used to measure the jitter of the motor endplates. This study examines the jitter of the stimulation site on the axon when stimulus strength is at threshold. In the absence of spurious blocking, this was found to be 5 µs on the average. With intermittent blocking, however, a mean additional jitter of 40 µs was obtained. The latter is considered to result from changing propagation velocity in the muscle fiber due to irregularity of activation rate. In clinical jitter studies, inadvertent threshold stimulation can result in significant error when associated with intermittent blocking.Keywords
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