Physical activity increases gains in and prevents loss of physical function: results from the lifestyle interventions and independence for elders pilot study.
Ip EH, Church T, Marshall SA, Zhang Q, Marsh AP, Guralnik J, King AC, Rejeski WJ. Physical activity increases gains in and prevents loss of physical function: results from the lifestyle interventions and independence for elders pilot study. J Gerontol A Biol Sci Med Sci. 2013 Apr; 68(4):426-32.