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Improving localization and measurements of M-waves using high-density surface electromyography.

Ernesto H Bedoy1,2,3,4, Efrain A Guirola Diaz5, Ashley N Dalrymple3,4,6,7

  • 1Center for Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.

Journal of Neurophysiology
|December 20, 2024
PubMed
Summary

High-density surface EMG (HD-sEMG) with spatial filters and ultrasound effectively isolates muscle M-waves in the forearm. This method significantly reduces crosstalk, improving accuracy for neurophysiological research and potential clinical applications.

Keywords:
M-wavescross talkhigh-density electromyographyperipheral nerve stimulationultrasound

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Motor Control

Background:

  • Surface electromyography (sEMG) is vital for muscle studies and prosthetic control.
  • Cross talk from adjacent muscles often compromises sEMG signal integrity.
  • High-density surface EMG (HD-sEMG) offers improved spatial resolution for signal isolation.

Purpose of the Study:

  • To assess HD-sEMG for precise M-wave localization in forearm muscles.
  • To evaluate the efficacy of spatial filters in mitigating sEMG cross talk.
  • To investigate the utility of ultrasound in verifying muscle activation sites.

Main Methods:

  • Peripheral nerve stimulation was applied to forearm muscles in five participants.
  • HD-sEMG recordings were analyzed for M-wave shape correlations and cross talk.
  • Bipolar and tripolar spatial filters were applied and compared to monopolar recordings.
  • Ultrasound imaging confirmed muscle identity and location relative to electrode grids.

Main Results:

  • HD-sEMG successfully isolated M-waves with minimal cross talk at low stimulation.
  • Spatial filters (bipolar, tripolar) significantly reduced cross talk at higher stimulation levels.
  • Tripolar filters demonstrated superior cross talk reduction (51.10% decay) compared to no filter (10.32%).
  • Ultrasound confirmed the accuracy of M-wave localization and muscle identification.

Conclusions:

  • Spatially filtered HD-sEMG accurately detects and isolates forearm muscle M-waves.
  • Spatial filtering is crucial for reducing cross talk in high-density EMG recordings.
  • Ultrasound imaging is a valuable tool for validating HD-sEMG findings in complex muscle anatomy.