It is widely believed that physical activity supports healthy ageing and helps to prevent cognitive decline, perhaps as a result of improving cardio-respiratory fitness. This systematic review examined the evidence concerning any beneficial influence(s) of aerobic exercise in improving cognitive functioning in older people without cognitive impairment. Twelve trials including 754 participants were considered. There was no discernible benefit from aerobic exercise in any domain of cognitive performance in cognitively healthy older adults, even when the intervention(s) did improve cardio-respiratory fitness.
Young, J. Angevaren, M. [and] Rusted, J. [et al] (2015). Aerobic exercise to improve cognitive function in older people without known cognitive impairment. The Cochrane database of Systematic Reviews. April 22nd 2015