Electrical Impedance Myography for Evaluating Paretic Muscle Changes After Stroke. IEEE Trans Neural Syst Rehabil Eng 2017 Nov;25(11):2113-2121
Date
06/03/2017Pubmed ID
28574361Pubmed Central ID
PMC6734926DOI
10.1109/TNSRE.2017.2707403Scopus ID
2-s2.0-85035363672 (requires institutional sign-in at Scopus site) 21 CitationsAbstract
Electrical impedance myography (EIM) was used to assess the paretic muscle intrinsic electrical properties post stroke. Twenty-seven subjects with chronic hemiparesis participated in this study. Muscle impedance was measured by applying high-frequency, low-intensity alternating current to biceps brachii muscles. Major EIM parameters, resistance ( ), reactance ( ), phase angle ( ), and electrical anisotropy ratios (AR) of the three parameters, were examined at 50 kHz. Statistical analysis demonstrated significant reduction of reactance, phase angle, AR of resistance, and AR of reactance in the paretic muscle compared with the contralateral side (Paretic X: , contralateral X: , and p < 0.001; Paretic : , contralateral : 14.5 ± 0.82°, and p < 0.001; Paretic AR of R: 0.969 ± 0.013, contralateral AR of R: 1.008 ± 0.011, and p < 0.02; and Paretic AR of X: 0.981 ± 0.066, contralateral AR of X: 1.114 ± 0.041, and p < 0.02). Correlation analysis, however, did not show any significant relationship between EIM parameters and clinical assessments. Findings of this paper indicated significant changes in the muscular intrinsic electrical properties after stroke, possibly related to structural modifications induced by loss of muscle fibers or fat infiltration as well as changes in the quality of cell membranes post stroke.
Author List
Li X, Li L, Shin H, Li S, Zhou PAuthor
Xiaoyan Li PhD Assistant Professor in the Neurology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AdultAged
Algorithms
Anisotropy
Electric Impedance
Electromyography
Female
Humans
Male
Middle Aged
Muscle, Skeletal
Paresis
Reproducibility of Results
Stroke