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  INTERRUPTED DIRECT CURRENT Interrupted direct current is also known as Galvanic Current. The frequency of interrupted direct current is 30 Hz and Duration is 100 ms. The rise and fall in intensity may be sudden or gradual.  Modified types of direct current includes : Rectangular, Trapezoidal, triangular, Saw-tooth and Depolarized. Physiological Effects Of I.d.c :                                                                     With the duration and intensity of current, a contraction of denervated muscle can be initiated. An impulse with a duration of 100 ms is the shortest that is generally considered satisfactory for the treatment of denervated muscle. Stimulation Of Sensory Nerves:    When an interrupted direct current is applied to the body, there is stimulation of sensory nerves. The impulses are of fairly long duration so the effect is rather marked, giving rise to a stabbing or burning sensation. There is a reflex dilatation of superficial blood vessels, and causes erythem

  FARADIC CURRENT: A Faradic current is a short-duration interrupted direct current with a pulse duration of 0.1-1 ms and a frequency of 50-100 Hz. Modified Faradic Currents: Modified faradic currents include the surging of current. they produce a near-normal tetanic like contractions and relaxation. The current is surged , so that intensity of impulses increases gradually. The circuit can b modified by giving surges of different durations and frequencies. Various forms of surges may b available, which are trapezoidal, triangular and saw-tooth impulses. Physiological Effects : The physiological effects of faradic currents are as follows: 1. Stimulation Of Sensory nerves:                                                           When a current of faradic type is applied to the body, a mild prickling sensation is felt. This is due to the stimulation of sensory nerves. The sensory stimulation causes a reflex vasodilation of the superficial blood vessels, thats why slight reddening of ski