“…The effect of an exercise intervention on BMD or bone strength was assessed in 11 RCT's [28, 32-35, 37, 38, 41, 44-48], of which ten RCT's compared an exercise group with an inactive control group or a sham intervention [28,32,33,37,38,41,[44][45][46][47][48]. In four of these RCT's, the duration of the intervention was less than a year [38,41,44,48].…”