1. Administration on Aging, Administration for Community Living, & U.S. Department on Health and Human Services A profile of older Americans 2012 http://www.aoa.gov/Aging_Statistics/Profile/2013/docs/2013_Profile.pdf
2. Physical activity and brain plasticity in late adulthood;Erickson;Dialogues Clin Neurosci,2013
3. Incidence of dementia and cognitive impairment, not dementia in the United States;Plassman;Ann Neurol,2011
4. Federal Interagency Forum on Aging-Related Statistics Older Americans 2012: Key indicators of well-being http://www.agingstats.gov/agingstatsdotnet/Main_Site/Data/2012_Documents/Docs/EntireChartbook.pdf
5. Capitalizing on cortical plasticity: influence of physical activity on cognition and brain function;Kramer;Trends Cogn Sci,2007