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Decomposition‐based quantitative electromyography: Methods and initial normative data in five muscles
Author(s) -
Doherty Timothy J.,
Stashuk Daniel W.
Publication year - 2003
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.10427
Subject(s) - electromyography , motor unit , vastus medialis , deltoid curve , biceps , motor unit recruitment , dorsum , physical medicine and rehabilitation , biomedical engineering , anatomy , pattern recognition (psychology) , medicine , computer science , artificial intelligence
Abstract Quantitative electromyographic (EMG) techniques provide clinically useful information to aid in the diagnosis and follow the course or response to treatment of diseases affecting the motor system. The purpose of this study was to describe a decomposition‐based quantitative electromyography method (DQEMG) designed to obtain clinically applicable information relating to motor unitpotential (MUP) size and configuration, and motor unit (MU) firing characteristics. Additionally, preliminary normative data were obtained from the deltoid, biceps brachii, first dorsal interosseous, vastus medialis, and tibialis anterior muscles of 13 control subjects. DQEMG was capable of efficiently and accurately extracting MUP data from complex interference patterns during mild to moderate contractions. MUP amplitude, surface‐detected MUP (S‐MUP) amplitude, MUP duration, number of phases, and MU firing frequencies varied significantly across muscles. The mean parameter values for the individual muscles studied were similar to previous reports based on other quantitative methods. The main advantages of this method are the speed of data acquisition and processing, the ability to obtain MUPs from MUs with low and higher recruitment thresholds, and the ability to obtain both S‐MUP or macro‐MUP data as well as MU firing rate information. Muscle Nerve 28: 204–211, 2003