https://orcid.org/0000-0002-3781-4273
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ABSTRACT
Background
Persons with stroke live with residual sensorimotor impairments in their lower limbs (LL), which affects their gait.
Purpose
We investigated whether these residual impairments and resulting gait deficits can be reduced through concurrently applied assisted movement, biofeedback, and proprioceptive stimulation.
Methods
A robotic device provided impairment-oriented training to the affected LL of 24 persons with stroke (PwS) with moderate-to-severe LL impairment. Participants were given 22–30 training sessions over 2–3 months. During training, the interventional device cyclically dorsiflexed and plantarflexed the ankle at 5 deg/s through ±15 deg for 30 min while the participant assisted with the imposed movement. Concurrently, participants received visual biofeedback of assistive joint torque or agonist EMG while mechanical vibration was applied to the currently lengthening (i.e. antagonist) tendon.
Results
Sensorimotor impairment significantly decreased over the training period, which was sustained over 3 months, based on the Fugl-Meyer Assessment (FMA-LL) (p < .001), modified Ashworth scale in dorsiflexors (p < .05), and an ankle strength test (dorsiflexors and plantarflexors) (p < .05). Balance and gait also improved, based on the Tinetti Performance Oriented Mobility Assessment (POMA) (p < .05).
Conclusion
Impairment-oriented training using a robotic device capable of applying assisted movement, biofeedback, and proprioceptive stimulation significantly reduces LL impairment and improves gait in moderately-to-severely impaired PwS.
Acknowledgments
The authors thank the members of the three research teams who collected and managed the data for this study.
Disclosure statement
The last author (Cordo) and Oregon Health & Science University have financial interests in a company (AMES Technology, Inc.) that could potentially benefit by the technology used in this study.