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Influence of the bipolar electrode transfer function on the electromyogram power spectrum
Author(s) -
Sinderby Christer A.,
Comtois Alain S.,
Thomson Robert G.,
Grassino Alejandro E.
Publication year - 1996
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/(sici)1097-4598(199603)19:3<290::aid-mus3>3.0.co;2-8
Subject(s) - electrode , power (physics) , spectral density , diaphragm (acoustics) , electromyography , materials science , physics , acoustics , vibration , chemistry , telecommunications , neuroscience , computer science , biology , quantum mechanics
This study demonstrates the impact of the bipolar electrode transfer function on the canine diaphragm electromyogram (EMG) power spectrum, as evaluated with a new electrode design and implantation technique. The results show that: (a) changes in interelectrode distance transformed single‐peaked power spectrums into double‐peaked spectrums; (b) the mean action potential conduction velocity (<⌅>APCV), and power spectrum center frequency (CF) and median frequency (MF), are related for interelectrode distances of 5 and 10 mm, but not for 15 and 20 mm; and (c) CF, MF, ‐3‐dB, and ‐6‐dB bandwidth values depend on interelectrode distance, cannot be used for physiological interpretations of the EMG power spectrum. Nonetheless, power spectrums obtained with fixed and appropriate interelectrode distances can be trusted, if the electrodes are positioned in the direction of the muscle fibers and in regions with low densities of motor endplates. © 1996 John Wiley & Sons, Inc.