Myopathies: The Neurogenic Hypothesis

McComas, Alan J.; Upton, AdrianR.M; Sica, RobertoE.P

doi:10.1016/s0140-6736(74)91368-3

Cited by 1 publication

(1 citation statement)

References 12 publications

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“…Concentric needle electromyogram (EMG) studies have reported fibrillation and sharp waves in stroke subjects [2][3]. Reductions of motor unit number and reduced maximum compound muscle action potentials (M wave) have been described in the paretic limbs after a stroke in the electrophysiological studies [1,4]. Evidence of motor unit degeneration was also reported in muscle biopsies of paretic limbs as atrophy of type II fibers, small angular fibers, and grouped atrophy [2,5].…”

Section: Introductionmentioning

confidence: 99%

Alterations in spike amplitude distribution of the surface electromyogram post-stroke

Suresh

Zhou

et al. 2011

2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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We examined surface electromyogram (EMG) characteristics during voluntary isometric activation of the first dorsal interosseous (FDI) muscle in stroke survivors. Five stroke subjects participated in the study. They were instructed to generate isometric contraction at different force levels. The recording was performed in both paretic and contralateral muscles using a matched force protocol. Comparisons of the spike amplitude distribution of the surface EMG signals were made between paretic and contralateral muscles. For a given contraction level, a widened or narrowed spike amplitude distribution was observed in paretic muscles of stroke subjects. Such differences may be induced by degeneration of some spinal motoneurons and/or disorganization of motor unit control properties after stroke.

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