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"Our findings are promising, but it is not entirely clear whether these improvements were the result of added vibration or just the effects of being more active," said lead author Tony Kaleth, associate professor in the School of Physical Education and Tourism Management at Indiana University-Purdue University Indianapolis.
Whole-body vibration exercise involves standing, sitting or lying on a machine with a vibrating platform that causes muscles to contract and relax as the machine vibrates. The machines primarily are used by researchers but have begun appearing in fitness centers and are sold commercially.
"Vibration training is increasingly being studied in clinical populations as a potential therapeutic mode of exercise training," Kaleth said. "Although the results are largely equivocal and in need of further study, studies have reported improvements in strength, muscle spasticity and pain in select populations."