Interferential Therapy, or IFT for short, is an electrotherapy treatment used to relieve pain. The purpose of interferential therapy is to cause two medium-frequency currents with marginally different frequencies to interfere with one another. For example, if Circuit A carries a current with a frequency of 4000 Hz and Circuit B carries a current with a frequency of 3980 Hz, the resulting low frequency is 20 Hz, which is quite useful in pain modulation. The frequency difference between the two medium-frequency currents formed in the tissues at the point where the two currents cross equals a new low-frequency current known as the beat frequency. It is primarily used to treat chronic, post-traumatic, and post-surgical pain.
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