Impact of skin-subcutaneous fat layer thickness on electrical impedance myography measurements: An initial assessment

Objective: To determine the impact of skin-subcutaneous fat layer thickness on electrical impedance myography (EIM) measurements. Methods: Linear 50 kHz EIM was performed on quadriceps of 62 healthy subjects (mean age 52.2 +/- 20.6 years) with a wide variety of skin-subcutaneous fat layer (SFL) thicknesses, as measured by ultrasound. Correlations were sought between the main EIM outcome parameter phase (theta) and SFL thickness. A multiple regression analysis was also performed for theta with SFL thickness and age as independent variables. Results: Mean skin-fat thickness was significantly different (p < 0.01) between men (0.76 +/- 0.23 cm) and women (1.43 +/- 10.51 cm). Neither linear nor quadratic fits produced significant correlations between theta and SFL thickness. A significant but weak positive correlation (r(2) = 0.14, p < 0.05) was seen between age and SFL thickness in women, but not in men. A strong negative correlation between age and theta was observed for both men (r(2) = 0.48, p < 0.01) and women (r(2) = 0.68, p < 0.01). In multiple regression analysis, age but not SFL thickness was found to have a significant association with theta. Conclusions: SFL thickness does not contribute substantially to the phase measured by linear-EIM. Significance: EIM data can be interpreted confidently in individuals with varying SFL thickness. (c) 2007 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.