Alterations in the peak amplitude distribution of the surface electromyogram poststroke

Xiaoyan Li*, Aneesha Suresh, Ping Zhou, William Zev Rymer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


We introduce a new method to examine the spinal motoneuron involvement after stroke using a surface electromyography (EMG) recording system. Fourteen chronic stroke survivors with mild to severe muscle weakness participated in the study. Surface EMG signals were collected from the first dorsal interosseous muscle while subjects performed isometric index finger abduction with paretic or contralateral hand at different matched force levels. Compared with the contralateral muscles, different patterns of peak amplitude distribution were observed at the paretic muscles, which could be induced by motor unit pathological alterations following a stroke. Compared with the conventional electrophysiological methods, the peak amplitude distribution analysis proposed in this study provides a convenient approach to help identify specific mechanisms of muscle weakness and other symptoms after stroke.

Original languageEnglish (US)
Pages (from-to)845-852
Number of pages8
JournalIEEE Transactions on Biomedical Engineering
Issue number3
StatePublished - 2013


  • Amplitude distribution
  • Peak detection
  • Stroke
  • Surface electromyography (EMG)

ASJC Scopus subject areas

  • Biomedical Engineering


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