Dynamic balance during walking adaptability tasks in individuals post-stroke
Document Type
Article
Publication Date
6-6-2018
Abstract
Maintaining dynamic balance during community ambulation is a major challenge post-stroke. Community ambulation requires performance of steady-state level walking as well as tasks that require walking adaptability. Prior studies on balance control post-stroke have mainly focused on steady-state walking, but walking adaptability tasks have received little attention. The purpose of this study was to quantify and compare dynamic balance requirements during common walking adaptability tasks post-stroke and in healthy adults and identify differences in underlying mechanisms used for maintaining dynamic balance. Kinematic data were collected from fifteen individuals with post-stroke hemiparesis during steady-state forward and backward walking, obstacle negotiation, and step-up tasks. In addition, data from ten healthy adults provided the basis for comparison. Dynamic balance was quantified using the peak-to-peak range of whole-body angular-momentum in each anatomical plane during the paretic, nonparetic and healthy control single-leg-stance phase of the gait cycle. To understand differences in some of the key underlying mechanisms for maintaining dynamic balance, foot placement and plantarflexor muscle activation were examined. Individuals post-stroke had significant dynamic balance deficits in the frontal plane across most tasks, particularly during the paretic single-leg-stance. Frontal plane balance deficits were associated with wider paretic foot placement, elevated body center-of-mass, and lower soleus activity. Further, the obstacle negotiation task imposed a higher balance requirement, particularly during the trailing leg single-stance. Thus, improving paretic foot placement and ankle plantarflexor activity, particularly during obstacle negotiation, may be important rehabilitation targets to enhance dynamic balance during post-stroke community ambulation.
Publication Title
Journal of Biomechanics
Volume
74
First Page
106
Last Page
115
Digital Object Identifier (DOI)
10.1016/j.jbiomech.2018.04.029
PubMed ID
29724539
ISSN
00219290
E-ISSN
18732380
Citation Information
Vistamehr, Balasubramanian, C. K., Clark, D. J., Neptune, R. R., & Fox, E. J. (2018). Dynamic balance during walking adaptability tasks in individuals post-stroke. Journal of Biomechanics, 74, 106–115. https://doi.org/10.1016/j.jbiomech.2018.04.029