The explanatory models that are given in the literature for the effects of Whole Body Vibration focus mainly on increased input from muscle spindles to the central nervous system. Muscle activation increases due to “neural adaptations” (37-41). In view of this, the Neurac method now includes a mechanical vibration device (Redcord Stimula). The purpose is to apply vibration to selected body parts during pain free, body-weight- bearing exercises with controlled and adjustable frequency, energy level, and duration.