Article

Reactive balance control is often impaired poststroke. Studies
addressing responses to laterally directed perturbations in this population are
currently lacking. Given that stroke-related motor impairments are unilateral, a
better understanding of reactive balance responses to these types of perturbations is critical. Objective: This study aimed to quantify differences in
reactive balance control in response to laterally directed perturbations in
people with chronic stroke, based on perturbation direction and ability to step
with either limb. Design: This study used a cross-sectional design. Methods:
Participants with chronic stroke (N = 19) were divided into groups representing
their ability to step with either limb, based on performance on a reactive
balance task in a baseline assessment. The preferred stepping limb was also
identified during this assessment. Each participant then underwent a series of
laterally directed perturbations on a motion platform. Behavioral measures were
compared between platform direction and group. Results: Trials with extra steps,
step initiation with the preferred limb, and crossover steps were more common
with platform motion toward the preferred limb compared to the nonpreferred limb;
the latter effect was only observed for participants with an impaired ability to
step with either limb. Side-step sequences were more common in those able to step
with either limb when the platform moved toward the preferred limb. Limitations:
The participant sample was likely higher functioning than the general population
of stroke survivors due to equipment constraints. Additionally, participants may
have developed strategies to use the platform's motion characteristics to aid
with balance recovery. Conclusions: These findings provide an indication of
responses to laterally directed perturbations in people with chronic stroke and
may help inform strategies for improving reactive balance control during stroke
rehabilitation.

Langue : ANGLAIS