Electro-acupuncture is a modern addition to acupuncture therapy. It utilizes the principles of Chinese Medicine (TCM), with the addition of a low-voltage electrical current passing through the needles during treatment. There is much scientific research supporting the efficacy of electro-acupuncture. This type of treatment is believed to affect the body's natural electrical currents within the nervous system and muscles. The intensity of the current is based on patient preference as well as the particular area of the body being treated, and the sensations can range from a barely detectable buzzing or vibrating to visible muscle contractions. Combining electrical current with acupuncture further helps to reduce muscle spasms, reduce tension in muscles and other soft tissues, reduce pain, and aid in recovery and injury prevention.