"You can feel your muscles contract,” he said. “It sort of fatigues you.” But if there is an effect, the researchers said, it seems to be short-lived. People seem to be slightly faster sprinters immediately after standing on a platform. They also seem to be able to jump a bit higher. Vibrations also seem to help people warm up before more strenuous exercise. “The effect wears off very quickly,” Dr. Brown said. “We are not talking about using this to play a 90-minute soccer match. One sprint and the effect would be gone. You’d play for one minute and still have 89 minutes to go.”
http://www.nytimes.com/2011/02/15/health/nutrition/15best.html?src=me&ref=health
I never thought there'd be a serious application for these things, who knew?
My guess is the effect is related to a kind of neurological reset, kind of like shaking yourself out to "loosen up" before trying a motor skill.
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