Test-retest reproducibility of 50 kHz linear-electrical impedance myography

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
Seward B RutkoveR Aaron

Abstract

Electrical impedance myography (EIM) is a method for evaluating muscle in which high-frequency, low-intensity alternating current is applied to a body region and the resulting surface voltage pattern over a muscle of interest is measured. In this study, the reproducibility for the simplest of these techniques, 50 kHz linear-EIM, was assessed for three muscles. Fifty kilohertz linear-EIM was performed on the biceps, quadriceps, and tibialis anterior of 30 normal subjects ranging in age from 21 to 90 years, and the major outcome variable, the spatially averaged phase (thetaavg), measured. The measurements were repeated within 250 days and comparisons between the two data sets made. Reproducibility, as measured by the intraclass correlation coefficients for all three muscles, was very high at 0.970, 0.971, and 0.938 for biceps, quadriceps, and tibialis anterior, respectively. Variability between measurements was on average 4.2% for all muscle combined, with an upper limit of 16.8%. Fifty kilohertz linear-EIM demonstrates excellent test-retest reproducibility. These results support the view that 50 kHz linear-EIM has the potential to be used as a simple, fast, and non-invasive measurement for the assessment of disease status, eithe...Continue Reading

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Citations

Jan 29, 2013·Physiological Measurement·C A Shiffman, S B Rutkove
Jul 31, 2010·Journal of Medical Engineering & Technology·O T OgunnikaJ L Dawson
May 27, 2011·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Lucy Lu WangSeward B Rutkove
Oct 15, 2010·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Codrin LunguSeward B Rutkove
Sep 28, 2007·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Seward B RutkoveCarl A Shiffman
Apr 20, 2006·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Dick F StegemanMachiel J Zwarts
Dec 24, 2014·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Tom R GeisbushBasil T Darras
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Jan 15, 2015·Neurotherapeutics : the Journal of the American Society for Experimental NeuroTherapeutics·Seward B Rutkove
Nov 5, 2016·Neurotherapeutics : the Journal of the American Society for Experimental NeuroTherapeutics·Benjamin Sanchez, Seward B Rutkove
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