I used to go to this department store, they had a load of home exercise equipment, including a vibration machine.
At the time, I had shocking Varicose Veins, felt bad. After 5-10 mins on the vibration plate, my legs felt great.
Was Googling last night, and it has real benefits for spasticity as well.
"Whole body vibration is beneficial for enhancing leg muscle strength among older adults."
Plenty of evidence out there.