FES to Improve Gait in CP

Aim 1: Assess the neurotherapeutic effects of FES-assisted treadmill and treadmill-only training on walking function relative to each other and to the control group. 1.1 The FES-assisted treadmill and treadmill-only groups will demonstrate greater improvements in walking speed and walking distance than the control group post-training and at follow-up. The FES-assisted treadmill group will show greater improvements than the treadmill-only group. 1.2 The FES-assisted treadmill and treadmill-only groups will demonstrate greater improvement in walking energy efficiency than the control group post-training and at follow-up. The FES-assisted treadmill group will show greater improvement than the treadmill-only group. 1.3 The FES-assisted treadmill and treadmill-only groups will demonstrate greater improvements in GMFM, perceived functional mobility, quality of life and self-perception measures than the control group post-training and at follow-up. The FES-assisted treadmill group will show greater improvements than the treadmill-only group. Aim 2: Assess the differential neurotherapeutic effects of FES-assisted treadmill and treadmill-only training on walking biomechanics. The investigators will measure these effects using instrumented motion capture. 2.1 The FES-assisted treadmill group will demonstrate greater improvements in gait kinematics in stance phase (higher peak hip and knee extension and lower peak ankle dorsiflexion) and swing phase (higher peak knee extension and larger knee excursion) than the treadmill only and non-intervention groups 2.2 The FES-assisted treadmill group will demonstrate greater improvements in lower extremity kinetics (lower hip and knee extensor moments and increased ankle plantarflexion power) than the treadmill only and non- intervention groups. 2.3 The FES-assisted treadmill group will demonstrate greater improvements in spatiotemporal gait parameters (increased step length and gait velocity, decreased step width and double support time) than the treadmill- only and control groups. Aim 3: Identify predictive measures of training efficacy. 3.1 Pre-training walking speed and energy efficiency will correlate with improvements in walking performance measures of Aim 1. 3.2 Increased neuroprosthetic correction of gait biomechanics measures achieved by FES will be positively correlated with walking performance measures of Aim 1.