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Merged plantarflexor muscle activity is predictive of poor walking performance in post-stroke hemiparetic subjects.
Brough, Lydia G; Kautz, Steven A; Bowden, Mark G; Gregory, Chris M; Neptune, Richard R.
Afiliación
  • Brough LG; Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, USA.
  • Kautz SA; Ralph H Johnson VA Medical Center, Charleston, SC, USA; Department of Health Sciences & Research and Division of Physical Therapy, Medical University of South Carolina, Charleston, SC, USA.
  • Bowden MG; Ralph H Johnson VA Medical Center, Charleston, SC, USA; Department of Health Sciences & Research and Division of Physical Therapy, Medical University of South Carolina, Charleston, SC, USA.
  • Gregory CM; Ralph H Johnson VA Medical Center, Charleston, SC, USA; Department of Health Sciences & Research and Division of Physical Therapy, Medical University of South Carolina, Charleston, SC, USA.
  • Neptune RR; Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, USA. Electronic address: rneptune@mail.utexas.edu.
J Biomech ; 82: 361-367, 2019 01 03.
Article en En | MEDLINE | ID: mdl-30528553
Stroke is the leading cause of long-term disability and individuals post-stroke often experience impaired walking ability. The plantarflexor (PF) muscles are critical to walking through their contributions to the ground reaction forces and body segment energetics. Previous studies have shown muscle activity during walking can be grouped into co-excited muscle sets, or modules. Improper co-activation, or merging of modules, is a common impairment in individuals post-stroke. The purpose of this study was to determine the influence of merged PF modules on walking performance in individuals post stroke by examining balance control, body support and propulsion, and walking symmetry. Muscle modules were identified using non-negative matrix factorization to classify subjects as having an independent or merged PF module. The merged group had decreased balance control with a significantly higher frontal plane whole-body angular momentum than both the independent and control groups, while the independent and control groups were not significantly different. The merged group also had higher paretic braking and nonparetic propulsion than both the independent and control groups. These results remained when comparisons were limited to subjects who had the same number of modules, indicating this was not a general effect due to subjects with merged PF having fewer modules. It is likely that a merged PF module is indicative of general PF dysfunction even when some activation occurs at the appropriate time. These results suggest an independent PF module is critical to walking performance, and thus obtaining an independent PF module should be a crucial aim of stroke rehabilitation.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Paresia / Caminata / Músculo Esquelético / Accidente Cerebrovascular / Pie Tipo de estudio: Prognostic_studies / Risk_factors_studies Límite: Female / Humans / Male / Middle aged Idioma: En Revista: J Biomech Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Paresia / Caminata / Músculo Esquelético / Accidente Cerebrovascular / Pie Tipo de estudio: Prognostic_studies / Risk_factors_studies Límite: Female / Humans / Male / Middle aged Idioma: En Revista: J Biomech Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos