I know a little bit about molecular biology, but not in any great depth.... so I know how a muscle contracts, but....
.... what I'm wondering is, will a muscle breakdown the same way as it does with heavy weights, if it's an EXTERNAL source providing the electro-stimulation? I mean, if it's something other than a nerve impulse from the brain, would it still have the same effect? That's what I wanna know.... I guess it would, as once there's calcium molecules released, it's the same process.
The other thing that makes me skeptical, is how it's not a very hard contraction. It's like a very rapid, weak contraction.... not like you're contracting really hard or anything, but more like just.... for example, bending at the elbow without holding any weight, and thinking it will work your biceps.