A bicycle ergometer for exercising paralyzed muscle in man is described. This system can be used for isotonic training for both the cardiovascular system and skeletal muscle for individuals who are paralyzed. The device cannot be used on individuals who have lower motor neuron lesions. The device is based upon a standard MonarkTMbicycle ergometer. The ergometer has been modified with sensors for feedback of crank position that an Apple IITMcomputer then uses to coordinate stimulation of muscles. The muscles used in the study are theiliacusandquadriceps. Exercise training to test the device was conducted on four paraplegic and quadriplegic subjects over a period of 30 days. Exercise was induced three times per week for a period of 15 minutes. Results of these experiments show an increase in endurance and muscle size.