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Several companies claim that it's possible.
They market electronic muscle stimulators. Ads claim that you can stick electrodes on your body and zap it with current to tone, tighten and gain strength in your muscles. It's been used for years in clinical settings and hospitals to help people maintain or gain muscle strength when they're confined to bed or have had surgery. Dimension went along to follow the first scientific trials to test whether these stimulators can build muscle in healthy people. Researchers at the University of Wisconsin-La Crosse have done dozens of fitness studies.