Normally, the nervous system controls the muscles by sending physiological electrical impulses to the muscle fibers via the nerves. Electro-stimulation is based on the same principle except that the electrical impulses are transmitted through the skin through the electrodes. The electrical impulse causes muscular contraction of the chosen muscle (s) without the central nervous system (brain) being used, which does not generate significant nervous fatigue. In both cases, the muscle reacts and contracts.
 And the electrical current sent to the nerves would help block the passage of painful information to the brain as well. The wicket would thus be closed between the nerves and the spinal cord, the normal way of transmitting the nerve impulses to the thalamus and the cerebral cortex.
 
 The low frequency currents (most often between 20 and 100 Hz) which are adapted to the human body are used to obtain an involuntary contraction of the muscle and the analgesic effect in NUGA BEST.