By Laura H.P. Eggermont, Vrije Universiteit, The Netherlands, and Erik J.A. Scherder, Rijksuniversiteit Groningen, The Netherlands, Dementia, Vol. 5, No. 3, 411-428 (2006), DOI: 10.1177/1471301206067115. A review of 27 scientific studies conducted between 1974 and 2006, concluding that physical activity can have a positive impact on cognition and well-being in older people, including beneficial effects on mood, sleep and functional ability in people with dementia.