Does ems (electrical muscle stimulation) help you burn fat or just tone your abbs?

Neither really. Ems has been around a long time and if really helpful would have supplanted real exercise by now. Toss it to the side, eat better, and get some exercise. Keep it around for bell's palsy or swallowing problems from a stroke i suppose but any significant results are likely not due to having that strapped on.

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Does ems (electrical muscle stimulation) belts help you burn fat or is it just marketing hype?

Build muscle. Dr.Kots was able to show, using a tensiometric device, that the muscle tension produced in a maximal ems contraction can be up to 30% higher than a maximal voluntary contraction. This finding was corroborated by independent studies and makes intuitive sense, given the nature of the body's energy conservation system. This paper was published 1973 in montreal concordia univ by dr.Kots of ussr. Read more...