@tsc shared these 2 articles in another discussion.
--- Whole-body vibration exercise in postmenopausal osteoporosis: https://pubmed.ncbi.nlm.nih.gov/26327887/
--- This one was published in November 2021 that warns about dangers of using high intensity vibration, especially with fragile bones:
https://melioguide.com/osteoporosis-exercise-equipment/whole-body-vibration-therapy/
Here's one I shared in another discussion that might also be helpful.
"Animal and human studies suggest that high-frequency, low-magnitude vibration therapy improves bone strength by increasing bone formation and decreasing bone resorption. There is also evidence that vibration therapy is useful in treating sarcopenia, which confounds skeletal fragility and fall risk in aging."
— Vibration therapy: clinical applications in bone – PMC – NCBI:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4458848/