Neuromuscular Electrical stimulation (NMES) uses an electrical current to cause a single muscle or a group of muscles to contract. Contracting the muscle via electrical stimulation helps recruit more muscle fibers to increase strength production within a muscle. Contraction of muscle also promotes blood supply to the area which assists in healing. Electrical stimulation may also be used to decrease muscle spasms, reduce/prevent atrophy, and decrease pain stimuli. Forms of electrical stimulation used for pain relief include: Interferential Current, Pre-Mod, and Hi-Volt.