Impaired lower limb muscle synergies post-stroke

Theresa H. Cruz, Yasin Y. Dhaher

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations

Abstract

Given the impaired motor output of the lower limb post-stroke, we argue that cortical damage alters the modular control structure underlying muscle activation patterns during both static and dynamic tasks. Muscle synergies were extracted from EMG collected during isometric hip torque production performed by chronic stroke and control subjects. The stroke group presented a reduction in muscle synergies, consistently displaying only two of the four characteristic synergies identified in the control group. These findings do not support a generalized co-contraction of muscles underlying motor impairments. Our data also indicated that the activation coefficients of the muscle synergies retained by the stroke group were altered. Finally, muscle synergies extracted from the isometric torque production tasks were able to account for a large portion of the variance in the gait EMG at similar limb postures in both subject groups. We therefore propose that muscle activation patterns during the swing phase of gait are constrained by the set of muscle synergies identified under the isometric conditions.

Original languageEnglish (US)
Title of host publicationProceedings of the 31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Subtitle of host publicationEngineering the Future of Biomedicine, EMBC 2009
PublisherIEEE Computer Society
Pages3956-3959
Number of pages4
ISBN (Print)9781424432967
DOIs
StatePublished - Jan 1 2009
Externally publishedYes
Event31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society: Engineering the Future of Biomedicine, EMBC 2009 - Minneapolis, MN, United States
Duration: Sep 2 2009Sep 6 2009

Publication series

NameProceedings of the 31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society: Engineering the Future of Biomedicine, EMBC 2009

Other

Other31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society: Engineering the Future of Biomedicine, EMBC 2009
CountryUnited States
CityMinneapolis, MN
Period9/2/099/6/09

ASJC Scopus subject areas

  • Cell Biology
  • Developmental Biology
  • Biomedical Engineering
  • Medicine(all)

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  • Cite this

    Cruz, T. H., & Dhaher, Y. Y. (2009). Impaired lower limb muscle synergies post-stroke. In Proceedings of the 31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society: Engineering the Future of Biomedicine, EMBC 2009 (pp. 3956-3959). [5333669] (Proceedings of the 31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society: Engineering the Future of Biomedicine, EMBC 2009). IEEE Computer Society. https://doi.org/10.1109/IEMBS.2009.5333669