‘Use it or Lose it: UMD Study Shows Stopping Exercise Decreases Brain Blood Flow’, http://umdrightnow.umd.edu/news/use-it-or-lose-it-umd-study-shows-stopping-exercise-decreases-brain-blood-flow, University of Maryland (AUGUST 29, 2016).

Cognitive problems

If you are less physically active, you are more likely to have cognitive problems and dementia as you age. (…) The take home message is simple – if you do stop exercising for 10 days, just as you will quickly lose your cardiovascular fitness, you will also experience a decrease in blood brain flow.