@article{Lang2007,
author = {Iain Lang and Jack Guralnik and David Melzer},
title = {Physical activity in middle-aged adults reduces risks of functional impairment independent of its effect on weight},
journal = {Journal of the American Geriatrics Society},
year = {2007},
month = {Nov},
volume = {55},
number = {11},
pages = {1836-1841},
issn = {1532-5415},
url = {http://www.blackwell-synergy.com/doi/abs/10.1111/j.1532-5415.2007.01426.x},
}