EMS (Electrical Muscle Stimulation) uses electric impulses to elicit muscle contraction. The electrical impulses omitted from an EMS device mimic signals normally coming from the central nervous system. They cause the repetitive contraction and relaxation of the muscle. Studies have shown EMS to be beneficial for the prevention of muscle edema and atrophy by increasing blood circulation. Positive results have also been shown for the adaptation (training) of skeletal muscle fibers.