Now,researchers with the Rehabilitation Institute of Chicago are working on another method called TMR, or targeted muscle reinnervation.

VOA: special.2009.03.10

His spinal cord had to be retrained to produce the muscle movements needed to stand and take assisted steps on the treadmill.

VOA: special.2011.06.01

Also on board is a new exercise machine, which is part of ongoing studies into the effects of long-term space flight on muscle and bone loss in astronauts.

VOA: standard.2010.04.05