http://nnr.sagepub.com/content/29/6/499?etoc
- Louis N. Awad, DPT1
- Stuart A. Binder-Macleod, PT, PhD1
- Ryan T. Pohlig, PhD1
- Darcy S. Reisman, PT, PhD1
- Darcy Reisman, Department of Physical Therapy, University of Delaware, 540 South College Avenue, Newark, DE 19713, USA. Email: dreisman@udel.edu
Abstract
Background. Elucidation of the relative importance of commonly targeted biomechanical variables to poststroke long-distance walking
function would facilitate optimal intervention design.
Objectives.
To determine the relative contribution of variables from 3
biomechanical constructs to poststroke long-distance walking
function and identify the biomechanical changes
underlying posttraining improvements in long-distance walking function.
Methods.
Forty-four individuals >6 months after stroke participated in this
study. A subset of these subjects (n = 31) underwent
12 weeks of high-intensity locomotor training.
Cross-sectional (pretraining) and longitudinal (posttraining change)
regression
quantified the relationships between poststroke
long-distance walking function, as measured via the 6-Minute Walk Test
(6MWT),
and walking biomechanics. Biomechanical variables
were organized into stance phase (paretic propulsion and trailing limb
angle),
swing phase (paretic ankle dorsiflexion and knee
flexion), and symmetry (step length and swing time) constructs.
Results. Pretraining, all variables correlated with 6MWT distance (rs = .39 to .75, Ps < .05); however, only propulsion (Prop) and trailing limb angle (TLA) independently predicted 6MWT distance, R
2 = .655, F(6, 36) = 11.38, P
< .001. Interestingly, only ΔProp predicted Δ6MWT; however,
pretraining Prop, pretraining TLA, and ΔTLA moderated this relationship
(moderation model R
2s = .383, .468, .289, respectively).
Conclusions.
The paretic limb’s ability to generate propulsion during walking is a
critical determinant of long-distance walking function
after stroke. This finding supports the development
of poststroke interventions that target deficits in propulsion and
trailing
limb angle.
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