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Selectivity Of Conventional Electrodes For Recording Motor Evoked Potentials: An Investigation With High‐Density Surface Electromyography, Alessio Gallina, Sue Peters, Jason L. Neva, Lara A. Boyd, Jayne Garland
Selectivity Of Conventional Electrodes For Recording Motor Evoked Potentials: An Investigation With High‐Density Surface Electromyography, Alessio Gallina, Sue Peters, Jason L. Neva, Lara A. Boyd, Jayne Garland
Physical Therapy Publications
Introduction
The objective of this study was to determine whether motor evoked potentials (MEPs) elicited with transcranial magnetic stimulation and measured with conventional bipolar electromyography (EMG) are influenced by crosstalk from non-target muscles.
Methods
MEPs were recorded in healthy participants using conventional EMG electrodes placed over the extensor carpi radialis muscle (ECR) and high-density surface EMG (HDsEMG). Fifty MEPs at 120% resting and active motor threshold were recorded. To determine the contribution of ECR to the MEPs, the amplitude distribution across HDsEMG channels was correlated with EMG activity recorded during a wrist extension task.
Results
Whereas the conventional EMG identified …