Functional electrical stimulation changes dynamic resources in children with spastic cerebral palsy

Area of Science:

• Biomedical Engineering
• Rehabilitation Science
• Pediatric Neurology

Background:

• Children with cerebral palsy (CP) frequently experience impaired walking ability.
• Gait abnormalities in CP can stem from difficulties in producing timely muscle force and altered joint mechanics.

Purpose of the Study:

• To investigate the impact of functional electrical stimulation (FES) on gastrocnemius-soleus muscle activation during walking in children with CP.
• To assess FES effects on force production (impulse), stiffness, stride length, and stride frequency.

Main Methods:

• A crossover study design involved 13 children with spastic CP and 6 typically developing children.
• Children with CP underwent walking trials with and without FES applied to the calf muscles.
• Kinematic data were analyzed using a biomechanical model to estimate impulse and stiffness.

Main Results:

• FES significantly increased speed-normalized dimensionless impulse in children with CP compared to their no-FES condition.
• No significant differences in impulse were observed between children with CP (no FES) and typically developing children.
• FES did not significantly alter stiffness, stride length, or stride frequency in children with CP.

Conclusions:

• Functional electrical stimulation is effective in enhancing walking impulse in children with CP.
• FES does not appear to reduce muscle-tendon stiffness or normalize spatiotemporal gait parameters.
• Further research may be needed to optimize FES parameters for more comprehensive gait improvement in CP.