Gymform Plus is a medical device. Having said this we know that there are similar products on the market that function in a similar fashion and they do claim to help with these and other various elements. Gymform Plus FAQ s 7. Varies from user to user and how well they take care of the pads. Those who clean the pads after each use, and replace the pads on the green piece of plastic that arrived with the pad, between uses as per the guidebook experience a longer life for their pads.
Problem is likely too hard and sudden a contraction.
If, however the feeling was more like an electrical shock or tingling sensation, then there are three possibilities. The first and most likely is that the pads are incorrectly placed. They may be able to correct with pad placement adjustment. Gymform makes no claims for weight loss . The manual tells the user to use two wires of the same color to stimulate any chosen muscle group.