Stepping characteristics during externally induced lateral reactive and voluntary steps in chronic stroke.
Vicki L Gray, Chieh-Ling Yang, Masahiro Fujimoto and 2 others
PMID 31078009WHAT IT FOUND
Stroke survivors initiated voluntary steps slower than controls but reacted to perturbations just as fast.
They used smaller, medial steps to recover balance, likely because weak hip muscles make the more stable lateral steps too difficult to execute quickly.
Key findings
01Stroke survivors initiated voluntary reaction time steps significantly slower than controls, but showed no difference in the time to initiate reactive steps.
02When recovering from a perturbation, stroke survivors predominantly took medial steps (moving the unloaded leg toward the loaded one) rather than the more stable lateral steps used by controls.
03Reduced hip abductor and adductor torque in stroke survivors was associated with slower step initiation times for both voluntary and reactive steps.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Small sample size (10 per group) limits generalizability. Few stroke participants performed lateral steps, preventing detailed analysis of that specific step type. The study describes preferred strategies, not necessarily the maximum capacity or potential for improvement with training.
Declared interests
None reported.
The easy way to misread this
Do not assume that preserved reactive step initiation time means the patient has adequate reactive balance. While the timing was similar to controls, the stroke group used less stable medial steps and had a lower tolerance for perturbations, indicating a compromised recovery strategy.