TENS: Transcutaneous Electrical Nerve Stimulation, means electrical stimulation of nerves through the skin. It is a non-medical method of treating pain from certain causes. TENS uses tiny electrical impulses sent through the skin to nerves to modify your pain perception. TENS does not cure any physiological problem; it only helps control the pain.
EMS: Electrical Muscle Stimulation, is a widespread and generally recognized method and has been used for years in sports and rehabilitation medicine. One of the uses of EMS is as a supplement to conventional muscle training, in order to increase the efficiency of muscle groups and adapt physical proportions to the desired aesthetic results. EMS application goes in two directions. On one hand, a targeted strengthening of musculature can be produced (Activating application) and on the other hand, a relaxing, resting effect can also be achieved.