Most are small battery-operated units with electrode pads that attach to the skin. The unit creates an electric current that stimulates muscles and numbs the workouts nerves by sending electric pulses into the nerves. The heat generated by the current can help reduce pain and stiffness by increasing the release of endorphins in the body. Although a TENS unit is designed to provide pain relief through nerve stimulation, placing the electrode pads correctly on a muscle can cause a strong muscular contraction. Using electrical muscle stimulation alone or in combination with TENS may help tone your muscles, particularly when used in addition to exercise and weight training. <br>Full story: http://www.livestrong.com/article/341708-tens-muscle-building/
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