Write a note on interrupted direct current. Also explain its physiological effects, indications and techniques of treatment?
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