Interferential current (IFC): is characterised by the crossing of two electrical medium, independent frequencies that work together to effectively stimulate large impulse fibres. These frequencies interfere with the transmission of pain messages at the spinal cord level. Because of the frequency, the Interferential wave meets low impedance when crossing the skin to enter the underlying tissue. This deep tissue penetration can be adjusted to stimulate parasympathetic nerve fibres for increased blood flow. Interferential Stimulation differs from TENS in that it allows a deeper penetration of the tissue with more comfort (compliance) and increased circulation.