Gentle zaps may help kids with cerebral palsy stay on their feet

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria for individuals with CP: 1. Age 10-21 2. Diagnosis of CP 3. GMFCS level I-II 4. Ability to stand up from a chair and start walking. 5. Migration index of proximal hip (MIGR) \< 40% femoral head covering in acetabulum 6. At least 0° passive dorsiflexion range of motion (ROM) 7. Sufficient visuoperceptual, cognitive and communication skills 8. Seizure-free or well-controlled seizures 9. No other neurological or musculoskeletal disorders (e.g. dystonia, severe scoliosis, hip instability 10. Ability to communicate pain or discomfort 11. Ability to assent/consent or obtain parent/guardian consent Exclusion Criteria for individuals with CP: 1. Scoliosis with primary curve \> 40% 2. Spinal fusions extending into pelvis 3. Lower Extremity joint instability or dislocation 4. Severe tactile hypersensitivity 5. Lower extremity botulinum injections in the past 6 months 6. Implanted medical device or metal contraindicative of the application of SR 7. Pregnancy (self-reported) 8. Severe lower extremity spasticity (Modified Ashworth Scale score of 4 or greater) 9. History of pulmonary disease limiting exercise tolerance (Asthma Control Test screen) 10. History of cardiac disease (American Heart Association screen) 11. Severely limited range of joint motion/ irreversible muscle contractures 12. Lower extremity surgery or significant injury within last 1 yr. Inclusionary criteria for typically developing volunteers: 1. Aged 10-21 years old 2. Ability to stand up from a chair and start walking without an assistive device or orthoses 3. Able to communicate discomfort during testing and can follow multi-step directions 4. Has not been diagnosed with any neurological or balance disorders 5. Seizure-free Exclusionary criteria for typically developing volunteers: 1. Diagnosis of CP 2. Significant scoliosis with primary curve \> 40° 3. Lower extremity surgery or fractures in the year prior testing 4. Joint instability or dislocation in the lower extremities 5. Severe tactile hypersensitivity 6. A history of selective dorsal root rhizotomy 7. Botulinum toxin injections in the lower extremities within the past 6 months 8. Marked visual or hearing deficits 9. Any embedded metal that may be contraindicated with application of SR 10. Severe spasticity of the lower extremity muscles (eg. a score of 4 on the Modified Ashworth) 11. Pregnancy (self-reported) 12. Severely limited joint range of motion/ irreversible muscle contractures that would not be candidates for soft-tissue surgery 13. Learning disabilities 14. History of neurological disorders 15. Balance and/or postural impairment