Effects of selectively assisting impaired subtasks of walking in chronic stroke survivors.
Simone S Fricke, Hilde J G Smits, Cristina Bayón and 3 others
PMID 33115480WHAT IT FOUND
Assisting specific walking subtasks with a robot improved those subtasks but did not fix other parts of the gait pattern.
Foot clearance assistance increased step length, but stability and weight shift assistance had little effect. Subtasks can likely be tuned simultaneously in mildly impaired patients.
Key findings
01Foot clearance assistance significantly reduced error and increased paretic step length by 0.02 m to 0.03 m, but did not significantly improve stance time.
02Weight shift assistance moved the pelvis but did not improve actual weight transfer to the paretic leg because foot placement did not change relative to the pelvis.
03Stability during stance assistance reduced error in that specific subtask but had no significant effect on other gait subtasks or spatiotemporal parameters.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only nine participants, all of whom were mildly impaired (Functional Ambulation Category score of 5). Participants walked on a treadmill while holding handrails, which may have restricted natural lateral movements and affected weight shift results. The short duration (2 minutes per trial) means these findings reflect immediate gait adaptation, not long-term recovery or motor learning. Some participants used passive toe-lifters, which may have influenced the baseline gait pattern.
Declared interests
Funded by the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Dutch Research Council). No commercial conflicts of interest are reported.
The easy way to misread this
Do not assume that assisting one specific gait subtask will correct other walking deficits. In this study, only the directly assisted subtask improved, and weight shift assistance specifically failed to improve actual weight transfer to the affected leg.