What are the types of low frequency current?

Medium frequency currents are the currents whose frequency falls between the range of 1000 to 10,000 Hz . They are being used therapeutically due to their advantage of greater penetration and with a higher tolerance and comfort over the low frequency current.

Starting form faradic type current, modified faradic current, electro-therapeutic currents including alternating, direct and pulsed currents, interrupted direct current, evenly alternating currents including sinusoidal currents and di-dynamic currents, Interrupted Galvanic current to the Electrical Nerve Stimulation, …

an alternating electric current having a frequency of 10,000 or more cycles per second ; it produces no muscular contractions and does not affect the sensory nerves.