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Fig. 3 | Journal of NeuroEngineering and Rehabilitation

Fig. 3

From: Rectus femoris hyperreflexia contributes to Stiff-Knee gait after stroke

Fig. 3

Experimental protocol and RF EMG feedback paradigm. The dashed square boxes indicate the four conditions in experimental protocol, Stand (right), during walking at toe-off Walk (right), where no visual feedback is provided. In both the Stand↑ (left) and Walk↑ (middle) conditions, visual feedback of RF EMG is provided for purposes of up-regulation during pre-swing. Participants were instructed to increase RF EMG signal above the threshold value (dashed gray line), 20% of RF maximum voluntary contraction (MVC) following a cue signal in real-time (purple vertical line) with 300 ms and 20 ms offset time prior to stimulation, respectively. For Walk↑, the cue was displayed every gait cycle to account for dynamic adaptation during walking. The trials were considered “successful” if the increased rectified RF EMG exceeded the threshold during stimulation (dashed horizontal line) and considered “fail” otherwise

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