Effect of four-month vertical whole body vibration on performance and balance. - Torvinen,S.; Kannus,P.; Sievanen,H.; Jarvinen,T.A.; Pasanen,M.; Kontulainen,S.; Jarvinen,T.L.; Jarvinen,M.; Oja,P.; Vuori,I. (Med Sci Sports Exerc, 2002)