Interferential stimulates the muscle in a way similar to a normal muscle contraction. It helps to reduce pain in the same way as TENS, using the pain-gate theory and also affects the circulation. At low frequencies of 0-10 Hz muscle stimulation occurs which helps the removal of any build-up of swelling. At higher frequencies, of 90-100 Hz, vasodilation occurs and increases the blood flow to the area to help healing.
