A bionic muscle stimulator reverses muscle atrophy, strengthens joints and enhances flexibility in those who have suffered stroke and spinal cord injuries, writes LINDA MARSA. 

IT sounds like one of those fitness products peddled in late-night infomercials – an implantable stimulator that electrically exercises muscles. But if current tests prove it effective, this miniature device could revolutionise the treatment of strokes and spinal cord injuries.