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Whole-Body Vibration continued...

What the Experts Say: While the experts who spoke with WebMD all agreed that WBV does offer some benefits, all cautioned that the level is nowhere near the claims being made.

"I've seen some remarkable results in terms of bone density -- working better than conventional exercise -- plus good effects on circulation and muscle stimulation for those who can't do conventional exercise," says Quist. "But I don't think it can help you lose weight or impact cellulite. There is really no solid medical evidence backing up these or other health claims."

Cedric Bryant, PhD, chief science officer of the American Council on Exercise, says while whole body vibration has potential, more research is clearly needed.

"Right now, the marketing and hype is greatly outpacing the research and the scientific evidence -- but that said, from a conceptual standpoint, it could presumably improve muscle strength and stability, and an increase in bone density," says Bryant.

Indeed, in one study of 90 postmenopausal women published in the Journal of Bone and Mineral Research in 2004, a group of Belgian researchers found almost a 1% increase in hip bone density among users of the Power Plate form of WBV, along with measurable increase in muscle strength.  The study participants used the machine for a total of 30 minutes three times a week for six months.

In another study, published in the Journal of the American Geriatric Society, researchers found that elderly people who were not able to participate in traditional exercise saw muscle strengthening and speed-of-movement benefits from using the Power Plate.

And in a study published in Proceedings of the National Academy of Sciences, mice that were placed on a low-vibration platform for 15 minutes, five days weekly, for 15 weeks ended up with smaller torsos than a group of mice who were put on a platform that didn't vibrate -- even though all the mice ate the same amount of food.

Still, Gerard Varlotta, DO, remains unconvinced that whole-body vibration can replace conventional exercise.

"We know that walking 2 miles a day is an effective way to build bone -- and I think it's OK to use this equipment as an adjunct to your normal exercise routines -- but to rely on it solely, we're not there yet," says Varlotta, director of physical therapy at the Rusk Rehabilitation Center at New York University Medical Center. 

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