Hi @jmanj and @eidelwiseess, Sorry I didn't get your full name in my comment above. I just read Margaret Martin's research on Whole Body Vibration Machines.
https://melioguide.com/osteoporosis-exercise-equipment/whole-body-vibration-therapy/
I'm quite sure the BOLT is a high intensity machine, not low intensity. While I haven't suffered any ill effects, I've decided to stop using it, based on her guidance. I'm sorry for posting about the whole body vibration and influencing others to consider this as an option. I will be looking into the low intensity vibration machines, but those are very expensive.