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Effects of temperature on motor unit action potentials during isometric contraction
Author(s) -
Bertram Martin F.,
Nishida Takashi,
Minieka Michael M.,
Janssen Imke,
Levy Charles E.
Publication year - 1995
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.880181215
Subject(s) - isometric exercise , motor unit , electromyography , concentric , electrophysiology , contraction (grammar) , dorsum , elbow , anatomy , compound muscle action potential , mathematics , medicine , biomedical engineering , physical medicine and rehabilitation , physical therapy , geometry
The effect of temperature on motor unit action potential (MUAP) configuration and recruitment was studied using automatic decomposition electromyography (ADEMG) recordings from a concentric needle electrode placed in the first dorsal interosseous (FDI) muscle of 10 normal adult subjects during isometric contraction. Focally cooling the FDI resulted in prolonged MUAP duration (P < 0.001, ANOVA), a finding congruent with those of Buchthal. Focal ulnar cooling at the elbow resulted in the increased MUAP frequency. In contrast to previous studies, there were no significant differences in amplitude or turns. Greater understanding of normal motor unit electrophysiology is necessary to improve diagnostic accuracy of EMG testing © 1995 John Wiley & Sons, Inc.