The goal of this clinical trial is to assess the effects of a plantar flexor eccentric training on muscle health of these muscles and teir descending command in chronic spastic hemiparesis. The effects of the strength and lower limb function will also be explored. The main question of this study is : do MG and SOL fascicle length and thickness can be modified after 2-months of eccentric training ? The experimental treatment will be compared to conventional therapy group (Gold standard). At D1, participants will be randomized into 2 groups: eccentric training versus conventional therapy for 8-weeks. Every participant will be assessed by blinded investigators at D1 and W8. In the eccentric training, patients will receive 3 sessions/week of a customized isokinetic eccentric program. in the control group, patients will follow their sessions of rehabilitation as before their inclusion.
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MG and SOL Architectural parameters
Timeframe: Day 0 ; Month 2