A Simulation Study to Investigate the Sensitivity of the Electromyogram to Conduction Velocity Changes of Individual Motor Units

Abstract

The sensitivity of a simulated surface electromyogram (SEMG) to changes in conduction velocity (CV) of individual motor units was assessed. Changes in the conduction velocity measurement and the median frequency and spectral compression measures of both the amplitude and power spectra of the SEMG were calculated. Results show that motor units close to the electrodes dominate the SEMG signal. Results also show that for changes in CV of individual motor units the CV measurement and the spectral measures differ. In the case of uniform changes in the CV of all motor units, changes in these measures are similar and unity sensitivity is observed. Indications from this preliminary study highlight the need for care when deducing the physiological significance of changes observed in the SEMG.

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Document Details

Document Type
Technical Report
Publication Date
Oct 25, 2001
Accession Number
ADA411518

Entities

People

  • M. O'malley
  • M. Rybansky
  • P. Nolan
  • R. Duff

Organizations

  • University College Dublin

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Correlation Techniques
  • Cross Correlation
  • Data Science
  • Databases
  • Diameters
  • Electrical Engineering
  • Electrodes
  • Electromyography
  • Engineering
  • Firing Rate
  • Frequency
  • Information Science
  • Muscle Fibers
  • Power Spectra
  • Simulations
  • Statistics
  • Universities

Readers

  • Auditory Neuroscience/Auditory Physiology.
  • Regression Analysis.
  • Vision Science/Vision Psychology/Cognitive Neuroscience.