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Old 06-01-2011, 12:57 PM   #3590
HungLikeJesus
Only looks like a disaster tourist
 
Join Date: Feb 2007
Location: above 7,000 feet
Posts: 7,208
You could be dehydrated. That reduces your blood volume and makes your heart work harder - or so I've read.

You could also be over-training.
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