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Colcombe, SJ, Erickson, KI, Scalf, PE, Kim, JS, Wadhwa, R, McAuley, E, Kramer, AF.  (2006).  Aerobic exercise training increases brain volume in aging humans: evidence from a randomized clinical trial.  Journal of Gerontology: Biological and Medical Sciences. 61(11): 1166-70.

Kramer, AF, Erickson, KI, Colcombe, SJ. (2006).  Exercise, cognition and the aging brain.  Journal of Applied Physiology.  101 (4): 1237-42.