SCI Acute Intermittent Hypoxia and Non-Invasive Spinal Stimulation Combined With Gait Training

OBJECTIVES: * To determine whether acute intermittent hypoxia therapy (AIH) combined with transcutaneous spinal cord stimulation during ambulation training modulates spinal locomotor networks in individuals with spinal cord injury * To determine whether acute intermittent hypoxia therapy (AIH) combined with transcutaneous spinal cord stimulation during ambulation training improves locomotor function in individuals with spinal cord injury * To determine whether acute intermittent hypoxia therapy (AIH) combined with transcutaneous spinal cord stimulation during ambulation training improves symmetry of gait in individuals with spinal cord injury * To determine whether acute intermittent hypoxia therapy (AIH) combined with transcutaneous spinal cord stimulation during ambulation training improves standing posture and balance in individuals with spinal cord injury * To determine whether ambulation efficiency (improved cardiovascular conditioning) improves with a combination of AIH, transcutaneous spinal cord stimulation and ambulation training in individuals with spinal cord injury