Describe the uses of CFES technology.

Computerized functional electrical stimulation (CFES or FES) directly applies low-level electrical stimulation to muscles that cannot receive these signals from the brain. CFES technology was originally developed by the National Aeronautics and Space Administration (NASA).
CFES has been used for many years in pacemakers and other implanted devices. It is now used to strengthen paralyzed muscles with exercise. It can be used to simulate a full cardiovascular workout for people who are paralyzed, reducing the secondary effects of paralysis. CFES even makes it possible to restore movement to some limbs paralyzed by stroke and spinal injury.