Utilizing a handheld electrode array for localized muscle impedance measurements

Muscle Nerve. 2012 Aug;46(2):257-63. doi: 10.1002/mus.23307.


Introduction: Electrical impedance myography (EIM) is a noninvasive technique used for assessment of muscle health in which a high-frequency, low-amplitude electric current is applied to the skin overlying a muscle, and the resulting surface voltage is measured. We have previously used adhesive electrodes, application of which is inconvenient. We present data using a handheld electrode array (HEA) that we devised to expedite the EIM procedure in a clinical setting.

Methods: Thirty-four healthy volunteers and 24 radiculopathy subjects underwent EIM testing using the HEA and adhesive electrodes.

Results: The HEA was shown to have good test-retest reproducibility, with intraclass correlation coefficients as high as 0.99. HEA data correlated strongly with data from adhesive electrodes, ρ = 0.85 in healthy volunteers (P < 0.001) and ρ = 0.75 in radiculopathy subjects (P < 0.001).

Conclusions: These data support the potential use of a handheld array for performing rapid localized surface impedance measurements.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Electric Impedance
  • Electromyography / instrumentation*
  • Electromyography / methods
  • Female
  • Humans
  • Male
  • Middle Aged
  • Muscle, Skeletal / physiology*
  • Radiculopathy / physiopathology*
  • Reproducibility of Results