Use of Transcutaneous Electrical Nerve Stimulation for Reducing Biologic Injection Site Pain(TENS Study)

The transcutaneous electrical nerve stimulation (TENS) unit is a noninvasive, inexpensive, battery-operated device that was originally designed to provide modulation of the afferent nervous system to relieve pain. By providing alternating current through cutaneous electrodes, TENS activates large-diameter afferent fibers of the nervous system (A-delta, A-beta, C fibers), whose ascending signals are subsequently relayed to the central nervous system.