There is one RCT (n=21) by Yarar-Fisher et al. (2013) examined the effect of whole-body vibration (WBV) on blood pressure while standing, and found that lower limb peripheral blood flow improved post-WBV. However, the clinical application of WBV in preventing orthostatic hypotension has not yet been studied.
There is level 1 evidence (Yarar-Fisher et al. 2013) that whole-body vibration increases standing mean arterial pressure in individuals with SCI.