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Jitter of the stimulated motor axon
Author(s) -
Trontelj Jože V.,
Stålberg Erik,
Mihelin Marjan,
Khuraibet Adnan
Publication year - 1992
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.880150405
Subject(s) - neuroscience , jitter , axon , physical medicine and rehabilitation , medicine , psychology , computer science , telecommunications
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.