Rehabilitation/exercise machine and system using muscle feedback

A system for exercising a muscle, the system comprising:

• a machine for at least one of rehabilitation and exercise, comprising:
• a frame;
• a first arm movably secured to the frame;
• a first actuator operatively connected to said first arm for displacing said first arm with respect to said frame;
• a first force sensor for measuring a force exerted by a user on said first arm;
• a control unit operatively connected to said first actuator and said first force sensor, said control unit being adapted for controlling a displacement speed for said first arm via said first actuator as a function of said force and for increasing said displacement speed of said first arm via said first actuator when said force is superior to a target force;
• and
• an electrical potential sensor for location on said muscle for measuring an electrical potential generated by said muscle of said user while said user is exerting said force on said first arm, said electrical potential sensor being operatively connected to said control unit, said control unit being adapted for lowering said target force when said electrical potential is superior to a predetermined maximum electrical potential.