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Increased voluntary drive is associated with changes in common oscillations from 13 to 60 Hz of interference but not rectified electromyography
Author(s) -
Neto Osmar P.,
Baweja Harsimran S.,
Christou Evangelos A.
Publication year - 2010
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.21687
Subject(s) - electromyography , interference (communication) , electrodiagnosis , physical medicine and rehabilitation , medicine , audiology , cardiology , telecommunications , computer science , channel (broadcasting)
The purpose of this study was to compare the capability of interference and rectified electromyography (EMG) to detect changes in the beta (13–30‐H Z ) and Piper (30–60‐H Z ) bands when voluntary force is increased. Twenty adults exerted a constant force abduction of the index finger at 15% and 50% of maximum. The common oscillations at various frequency bands (0–500 H Z ) were estimated from the first dorsal interosseous muscle using cross wavelets of interference and rectified EMG. For the interference EMG signals, normalized power significantly ( P < 0.01) increased with force in the beta (9.0 ± 0.9 vs. 15.5 ± 2.1%) and Piper (13.6 ± 0.9 vs. 21 ± 1.7%) bands. For rectified EMG signals, however, the beta and Piper bands remained unchanged ( P > 0.4). Although rectified EMG is used in many clinical studies to identify changes in the oscillatory drive to the muscle, our findings suggest that only interference EMG can accurately capture the increase in oscillatory drive from 13 to 60 H Z with voluntary force. Muscle Nerve, 2010