Exercise training increases size of hippocampus and improves memory.

Erickson KI, Voss MW, Prakash RShaurya, Basak C, Szabo A, Chaddock L, Kim JS, Heo S, Alves H, White SM, et al.
Proc Natl Acad Sci U S A. 2011 Feb 15; 108(7):3017-22. PMID: 21282661. Abstract
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Physiology

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This article provides important informaiton about the effect of aerobic exercise on hippocampal volume, further supporting the concept of brian plasticity. 

This article provides important informaiton about the effect of aerobic exercise on hippocampal volume, further supporting the concept of brain plasticity. 

This key paper was one of the first and few RCT to convincingly show the influence of physical activity in promoting better brain structure.