Comparison of the effects of real-time propulsive force versus limb angle gait biofeedback on gait biomechanics.
Justin Liu, Vincent Santucci, Steven Eicholtz and 1 others
PMID 33129170WHAT IT FOUND
In ten healthy adults, telling people to extend their leg further back at push-off increased forward propulsion just as much as telling them to push harder.
Targeting leg angle may help patients who cannot generate strong ankle push-off, but this was an immediate effect in healthy walkers.
Key findings
01Biofeedback targeting trailing limb angle increased propulsive force in the targeted leg to a similar degree as biofeedback targeting propulsive force directly.
02Increasing trailing limb angle did not significantly increase ankle power, suggesting the gain in propulsion came from limb position rather than stronger ankle push-off.
03Unilateral trailing limb angle biofeedback caused significant increases in trailing limb angle in both legs, whereas propulsive force biofeedback affected only the targeted leg.
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 ten young, healthy adults, so results may not apply to older adults or people with gait impairments like stroke. Trial order was not randomized; all participants did propulsive force feedback before trailing limb angle feedback, which could influence learning or strategy adoption. The study measured immediate effects during a single session, not long-term motor learning or functional gait speed improvements. Participants held a handrail, which may have altered natural gait mechanics. Ankle moment and power analyses excluded two participants due to measurement errors, reducing the sample size for those specific outcomes to eight.
Declared interests
The authors declared no conflicts of interest. The study was supported by NIH grant funding.
The easy way to misread this
Do not assume this treatment works for patients with gait disorders. This was a small pilot in healthy young adults measuring immediate biomechanical changes, not long-term functional improvement or efficacy in impaired populations.