brain

Concussions, and even lesser subconcussive head trauma, may speed up the brain's natural aging process says a new study which found changes in gait, balance, and in the brain's electrical activity in areas measuring attention and impulse control in otherwise healthy college students with a history of concussion.

Researchers have found an association between physical fitness and the brain in 9- and 10-year-old children: Those who are more fit tend to have a bigger hippocampus and perform better on a test of memory than their less-fit peers.