Our expert says:
I'm afraid I'm going to have to disagree with at least one point completely. The other points you make are correct, but then what people need to decide is which is better?
Now the first point is that a fat molecule that vibrates is broken down - not true. The use of any fuel, including fats, requires enzymes to be active, and these enzymes are active as a result of what is called the sympathetic nervous system. I'm not going to go into detail, but basically, if you want the sympathetic nervous system to be most active, vibrating the body part doesn't work, you need whole body exercise. That's why jogging, cardio etc. elevate the metabolic rate the most ACUTELY. So the idea that a vibration device will burn fat simply by breaking it down manually is incorrect - the body is not structual in that way.
As for the second point, the muscle is not being stimulated. Remember, muscle is stimulated by nerves, not vibrations. Therefore, unless you are applying a massive electrical current to it, it is not stimulated anything like exercise would. So the vibration won't cause muscle growth to compare to exercise, be it resistance or cardio training.
So the point is that the effect you would get from this type of device is extremely limited. What I won't argue with is that notion that any exercise is beneficial, including this kind of device. But that's not really the point - people have other choices, so it's not a case of does it work? That's the basic question, but the real question that needs to be answered is "Does it work better than the alternatives". The analogy is "Should I buy this car?". Well, of course, the answer could well be yes, it goes from A to B and looks good. But the real question is "Should I buy Car A instead of Car B?". And when you do that, then the devices like the Shake and Shape, and others on the market really do fail to do the job, regular cardio training and resistance work is far more effective. Hence, they don't work effectively enough to suggest using them.
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