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Simulation and analysis of the electromyographic interference pattern in normal muscle. Part I: Turns and amplitude measurements
Author(s) -
Nandedkar Sanjeev D.,
Sanders Donald B.,
Stålberg Erik V.
Publication year - 1986
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.880090507
Subject(s) - amplitude , concentric , motor unit , electromyography , interference (communication) , electrophysiology , signal (programming language) , electrodiagnosis , biomedical engineering , mathematics , anatomy , physics , medicine , neuroscience , computer science , physical medicine and rehabilitation , channel (broadcasting) , geometry , psychology , cardiology , telecommunications , optics , programming language
The electromyographic (EMG) interference pattern (IP) was simulated by adding together motor unit action potentials (MUAPs) of different sizes that had been recorded by a concentric needle EMG electrode. The number of turns (NT) of the simulated IP increased with the number of MUAP discharges. The mean amplitude (MA) difference between successive turns in the IP increased when large amplitude MUAPs were added. Our analysis demonstrates that the MA of the IP is determined mainly by the amplitude of large MUAPs in the signal and that large amplitude spikes are more likely to be generated by single large amplitude MUAPs than by summation of several small amplitude MUAPs.