Electromyographic analysis of postural responses during standing leg flexion in adults with hemiparesis

L. D. Hedman*, M. W. Rogers, Y. C. Pai, T. A. Hanke

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The purpose of this study was to examine muscle activation patterns during standing single leg flexion in adults with hemiparesis. Specifically, the electromyographic activation patterns of the flexing limb biceps femoris and gluteus medius, and the stance limb gluteus medius muscles were analyzed as a function of whether the muscles were paretic or not. Delayed activation of the affected flexing side gluteus medius, as compared with unaffected flexing side gluteus medius, resulted in it being activated simultaneous with the flexing biceps femoris rather than preceding it as was previously found in healthy subjects. This suggests a temporal change in the sequential mode of coordination of the postural and intended components of the task. In addition, the magnitude of the electromyographic integrals of both the affected and unaffected flexing side gluteus medius in the early propulsive phase of the task was significantly reduced in comparison with healthy subjects. These alterations can be attributed to spatial alterations in the sequential form of organization or to a shift to a different mode of neural control in order to perform a relatively novel task. These results suggest a potential adaptive capacity in these individuals.

Original languageEnglish (US)
Pages (from-to)149-155
Number of pages7
JournalElectroencephalography and Clinical Neurophysiology - Electromyography and Motor Control
Volume105
Issue number2
DOIs
StatePublished - Apr 1997

Keywords

  • balance control
  • hip abductor muscles
  • human stance
  • postural adjustments
  • rehabilitation strategies
  • stroke

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Neurology

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