How fast you can throw a ball or run or swerve a steering wheel depends on how speedily brain cells fire off commands to muscles. Fast firing depends on good insulation for your brain's wiring. Now new research by neurologists at UCLA suggests that in middle age, even healthy people begin to lose some of that insulation in a motor-control part of the brain, at the same rate that their speed subtly slows. The research points to another reason to stay physically and mentally active: An active, exercised brain may detect fraying insulation quicker and signal for repair cells to get to work.
http://tinyurl.com/5kqobt
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