12/9/2023 0 Comments Ashley south benchmark ptParetic and nonparetic leg data are illustrated in grey and black, respectively. The whiskers illustrate the 5 th and 95 th percentiles. Box-and-whisker plots for (b) step length and (d) single limb support duration (SLS%) illustrate the distribution of the individual leg data. The vertical gray shaded areas denote the SI values that represent symmetry (0.475 ≤ SI ≤ 0.525). Individual data are illustrated the vertical black line represents the group median. The symmetry index calculated for step length results in the paretic step ratio (PSR) used to categorize asymmetry groups ( see Step length and percent of the gait cycle spent in single limb support were used to assess spatial and temporal symmetry. (a) Spatial and (c) temporal symmetry were calculated with a symmetry index (SI) with the general equation SI =Xp/(Xp+Xnp), where Xp and Xnp are the paretic and nonparetic values for the variable of interest, respectively. The Symmetrical group (n=17) was characterized by equivalent paretic and nonparetic step lengths while walking overground. Gait Locomotor training Non-paretic training Spatiotemporal parameters Stroke Symmetry. Despite group differences in asymmetry characteristics, improvements in symmetry noted in each group were driven by changes in both the paretic and nonparetic limbs. We identified differential responses to locomotor task conditions between groups with distinct asymmetry patterns, suggesting these subgroups may require unique intervention strategies. Task conditions consistent with locomotor training do not produce uniform effects across subpatterns of gait asymmetry. Importantly, we found the TM and BWS conditions were insufficient to impact either spatial or temporal gait symmetry. Guidance NP induced an acute spatial symmetry only in the NP short group and temporal symmetry in the Symmetrical and P short groups. We identified differences in the response to locomotor task conditions for each step length asymmetry subgroup. Our primary metrics were: symmetry indices of step length, stride length, and single limb support duration. Overground data were compared against three task conditions all tested during treadmill walking: self-selected speed with 0% body weight support (TM) self-selected speed with 30 % body weight support (BWS) and fastest comfortable speed with 30 % body weight support and nonparetic leg guidance (Guidance NP). Participants first walked overground at their self-selected walking speed. ![]() The purpose of this study was to determine whether differential responses to locomotor task condition occur on the basis of step length asymmetry pattern (Symmetrical, NP short, P short) observed during overground walking. Furthermore, differential patterns of gait asymmetry may respond differently to gait training parameters. Gait asymmetry, prevalent among stroke survivors who regain the ability to walk, is associated with an increased energy cost of walking and is a significant predictor of falls post-stroke. However, current gait rehabilitation approaches fail to demonstrate consistent benefits. Given the prevalence of gait dysfunction following stroke, walking recovery is a primary goal of rehabilitation.
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