There are roughly 282,000 individuals living with spinal cord injury in the United States alone (National Spinal Cord Injury Statistical Center, Birmingham, AL, USA). Spinal cord injury often results in permanent functional impairments with only a limited capacity for spontaneous recovery. For the ret of motor function, such as locomotion or hand and arm dexterity, rehabilitative training is the principal means to maximize the endogenous recovery of the cen-tral nervous system.