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A model to predict the effect of calf muscle stimulation at push-off


Thomas Bosgiraud, C. Monaghan, D. Kotiadis, R. Riener, P. Veltink

Annual Conference of the International Functional Electrical Stimulation Society, pp. 159-161

A three degree of freedom model was developed to describe how limited muscle strength faced by stroke victims influences their gait push-off abilities. This should help to understand how FES timing of the plantarflexors (gastrocnemii and soleus) affects the push-off for the stroke victims.The system consists of foot, shank and thigh segments. The trunk is represented as a single point mass placed at the hip. Using this model, simulations of the lower leg behaviour with different stimulation patterns (ramps and blocks), timings and strengths have shown that calf muscle stimulation may improve push-off and knee flexion at the end of stance. However, the improvements are conditioned by the precision of the stimulation timing and strength. Stimulation ramps and blocks starting respectively at 25% of gait and at 32% of gait were predicted to yield beneficial effects on gait. In reality the stimulation should occur earlier to take into account the time delay between muscle twitch, which correspond to the timings indicated in this article, and the electrical stimulation. The modeled centre of mass, whatever the stimulation, was too slow because the trunk was placed at the hip and not on a special segment that would describe the trunk.


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% Autogenerated BibTeX entry
@InProceedings { BosEtal:2004:IFA_2003,
    author={Thomas Bosgiraud and C. Monaghan and D. Kotiadis and R. Riener and P.
    title={{A model to predict the effect of calf muscle stimulation at
    booktitle={Annual Conference of the International Functional
	  Electrical Stimulation Society},
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