Mary
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In medical terms is physical stress on the body considered to be a stress the same as a stress on the brain. Ie would someone who exercises to a high level be considered stressed the same as someone under a lot of pressure from work or money or relationships etc.?
I saw a cardiologist during the week for my POTS and she mentioned in passing that
she had seen many marathon runners with same.
She couldn't back it up with anything when I probed and she did say it could be that she just happened to get refferred more marathon running patients but I did find it odd that she said it, given my personal association of onset with exercise.
Excessive high level exercise can lead to chronically elevated cortisol levels and other damage to the body:
http://chriskresser.com/why-you-may-need-to-exercise-less/
http://running.competitor.com/2014/...isol-and-should-you-be-worried-about-it_39176
There's lots of info about the potentially harmful effects of endurance training and heart damage in marathon runners.