Longitudinal study in eastern Finland started in 1970s: Of the 2000 people in the study, 76 had Alzheimer’s disease in 1998. Those who had been physically active in midlife (e.g., leisure-time physical activity that lasts at least 20-30 minutes and causes breathlessness and sweating) were less likely to have Alzheimer’s and other dementia. (Fields, Helen (writer). Physical Exercise May Stave off Alzheimer’s. U S News and World Report. Reported October, 2005, article)