The review included 98 randomized, controlled trials with a total of 11,061 participants with an average age of 73. Of the total participants, 59 percent were categorized as healthy adults, 26 percent had mild cognitive impairment and 15 percent had dementia. A total of 58 percent did not regularly exercise before being enrolled in a study.

Exercise for cognitive brain health in aging Joyce Gomes-Osman, Danylo F. Cabral, Timothy P. Morris, Katalina McInerney, Lawrence P. Cahalin, Tatjana Rundek, Augusto Oliveira, Alvaro Pascual-Leone Neurology: Clinical Practice May 2018, 10.1212/CPJ.0000000000000460; DOI:10.1212/CPJ.0000000000000460