Highly Demanding Resistive Vibration Exercise Program is Tolerated During 56 Days of Strict Bed-Rest - Rittweger, J; Belavy, D; Hunek, P; Gast, U; Boerst, H; Feilcke, B; Armbrecht, G; Mulder, E; Schubert, H; Richardson, C; de Haan, A; Stegeman, D F; Schiessl, H; Felsenberg, D (International Journal of Sports Medicine, 2006)