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Examination of Hand Muscle Activation and Motor Unit Indices Derived from Surface EMG in Chronic Stroke.

Authors :
Xiaoyan Li
Jie Liu
Sheng Li
Ying-Chih Wang
Ping Zhou
Source :
IEEE Transactions on Biomedical Engineering. Dec2014, Vol. 61 Issue 12, p2891-2898. 8p.
Publication Year :
2014

Abstract

In this study, we used muscle and motor unit indices, derived from convenient surface electromyography (EMG) measurements, for examination of paretic muscle changes post stroke. For 12 stroke subjects, compound muscle action potential and voluntary surface EMG signals were recorded from paretic and contralateral first dorsal interosseous, abductor pollicis brevis, and abductor digiti minimi muscles. Muscle activation index (AI), motor unit number index (MUNIX), and motor unit size index (MUSIX) were then calculated for each muscle. There was a significant AI reduction for all the three muscles in paretic side compared with contralateral side, providing an evidence of muscle activation deficiency after stroke. The hand MUNIX (defined by summing the values from the three muscles) was significantly reduced in paretic side compared with contralateral side, whereas the hand MUSIX was not significantly different. Furthermore, diverse changes in MUNIX and MUSIX were observed from the three muscles. A major feature of the present examinations is the primary reliance on surface EMG, which offers practical benefits because it is noninvasive, induces minimal discomfort and can be performed quickly. [ABSTRACT FROM PUBLISHER]

Details

Language :
English
ISSN :
00189294
Volume :
61
Issue :
12
Database :
Academic Search Index
Journal :
IEEE Transactions on Biomedical Engineering
Publication Type :
Academic Journal
Accession number :
100027916
Full Text :
https://doi.org/10.1109/TBME.2014.2333034