--Disease Characteristics-- Traumatic or ischemic spinal cord injury Single lesion between thoracic vertebrae 1 and 12 Confirmed by computerized tomography or magnetic resonance imaging At least 12 months since onset of injury Motor recovery as follows: Ability to step not recovered OR Abnormal gait and maximum walking speed below one-half normal slow casual velocity of 60 meters/minute --Prior/Concurrent Therapy-- At least 3 months since completion of outpatient physical therapy Antispasticity agents tapered to lowest dose that limits flexor or extensor spasms interfering with sitting or comfort --Patient Characteristics-- Age: 16 to 60 Other: No clinically significant depression No drug abuse No urinary tract infection No painful musculoskeletal dysfunction, e.g., contracture or unhealed fracture No pressure sore No other medical contraindication to treadmill training, e.g.: Cardiopulmonary disease Dysautonomia