J Bone Miner Res. 2015 Jul;30(7):1319-28. doi: 10.1002/jbmr.2448.

Low-Magnitude Mechanical Stimulation to Improve Bone Density in Persons of Advanced Age: A Randomized, Placebo-Controlled Trial.

Kiel DP, Hannan MT, Barton BA, Bouxsein ML, Sisson E, Lang T