Inclusion Criteria:  18 years of age. spinal cord injury for greater than or equal to 6 months. spinal cord injury at a cervical neurologic level of injury.  Exclusion Criteria:  ventilator dependent. history of fractures. pressure sore or skin issues. history of illicit drug abuse. history of cardiac, respiratory, bladder, renal or other medical disorder unrelated to spinal cord injury. bladder Botox injections less than 12 months prior. muscle Botox injections less than 12 months prior. colostomy bag or urostomy. implanted pump (i.e., baclofen pump, pain pump, etc). If I am female: I am pregnant at the time of enrollment or planning to become pregnant during the course of the study. unable to wean from anti-spasticity medication. contraindications to MRI imaging (pacemaker, metallic foreign body, aneurysm clip, etc.)