Couch potatoes may have smaller brains later in life

http://www.eurekalert.org/pub_releases/2016-02/aaon-cpm020416.php

Public Release: 10-Feb-2016
Couch potatoes may have smaller brains later in life
American Academy of Neurology

Poor physical fitness in middle age may be linked to a smaller brain size 20 years later, according to a study published in the February 10, 2016, online issue of Neurology®, the medical journal of the American Academy of Neurology.

"We found a direct correlation in our study between poor fitness and brain volume decades later, which indicates accelerated brain aging," said study author Nicole Spartano, PhD, with Boston University School of Medicine in Boston.

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The study also showed that people whose blood pressure and heart rate went up at a higher rate during exercise also were more likely to have smaller brain volumes two decades later. Spartano said that people with poor physical fitness often have higher blood pressure and heart rate responses to low levels of exercise compared to people with better fitness.

Spartano noted that the study is observational. It does not prove that poor physical fitness causes a loss of brain volume; it shows the association.

"While not yet studied on a large scale, these results suggest that fitness in middle age may be particularly important for the many millions of people around the world who already have evidence of heart disease," she said.