Yancey AK, Wold CM, McCarthy WJ, et al. Physical inactivity and overweight among Los Angeles County adults. American Journal of Preventive Medicine 2004;27:146-52. Vance DE, Wadley VG, Ball KK, Roenker DL, Rizzo M. The effects of physical activity and sedentary behavior on cognitive health in older adults. Journal of Aging and Physical Activity 2005;13:294–313. Paluska SA, Schwenk TL. Physical activity and mental health: current concepts. Sports Medicine 2000;29:167-80.