While most people know that the U.S. Food & Drug Administration (FDA) regulates, well, food and drugs, some people may not realize the federal agency also regulates medical devices. According to its ...

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A muscle stimulator is a handheld or larger machine with connected electrodes. Larger machines usually only exist in therapy clinics or doctor’s offices, while handheld devices are used at home.

Both Electrical Muscle Stimulation (EMS) and Transcutaneous Electrical Nerve Stimulation (TENS) use low-voltage electrical currents that are applied to the body through gel pads. In TENS therapy, the ...