Assessing altered motor unit recruitment patterns in paretic muscles of stroke survivors using surface electromyography.

Abstract:

OBJECTIVE:The advancement of surface electromyogram (sEMG) recording and signal processing techniques has allowed us to characterize the recruitment properties of a substantial population of motor units (MUs) non-invasively. Here we seek to determine whether MU recruitment properties are modified in paretic muscles of hemispheric stroke survivors. APPROACH:Using an advanced EMG sensor array, we recorded sEMG during isometric contractions of the first dorsal interosseous muscle over a range of contraction levels, from 20% to 60% of maximum, in both paretic and contralateral muscles of stroke survivors. Using MU decomposition techniques, MU action potential amplitudes and recruitment thresholds were derived for simultaneously activated MUs in each isometric contraction. MAIN RESULTS:Our results show a significant disruption of recruitment organization in paretic muscles, in that the size principle describing recruitment rank order was materially distorted. MUs were recruited over a very narrow force range with increasing force output, generating a strong clustering effect, when referenced to recruitment force magnitude. Such disturbances in MU properties also correlated well with the impairment of voluntary force generation. SIGNIFICANCE:Our findings provide direct evidence regarding MU recruitment modifications in paretic muscles of stroke survivors, and suggest that these modifications may contribute to weakness for voluntary contractions.

journal_name

J Neural Eng

authors

Hu X,Suresh AK,Rymer WZ,Suresh NL

doi

10.1088/1741-2560/12/6/066001

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

066001

issue

6

eissn

1741-2560

issn

1741-2552

journal_volume

12

pub_type

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