NASA-funded scientists suggest that astronauts might prevent bone loss by standing on a lightly vibrating plate for 10 to 20 minutes each day. Held down with the aid of elastic straps, the astronauts could keep working on other tasks while they vibrate. The same therapy, they say, might eventually be used to treat some of the millions of people who suffer from bone loss, called osteoporosis, here on Earth.
http://vibroacoustic.org/FrequencyInfo/Research%20Articles/Good_Vibrations.pdf
Good Vibrations - Treatment for Astronauts