Feasibility Nutritional Supplements for Muscle Growth in CP

Inclusion Criteria: Spastic Cerebral Palsy (diagnosed by a neuro-pediatrician from the CP Reference Centre of the University Hospital Leuven) * Uni- of bilateral involvement * Level II or III on the Gross Motor Function Classification System (GMFCS) * Muscle volume for the medial gastrocnemius (target muscle) of at least 20% compared to the expected muscle volume in age-matched typically developing children Exclusion Criteria: * Presence of dyskinesia or ataxia * Severe co-morbidities * Botulinum toxin treatment ten months prior to assessment * Previous orthopedic or neurosurgery * Severe ankle deformities preventing fitting in test positions * Ankle range of motion (ROM) \<30% of normal values