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Author: sykesix Big gold star, 5000 posts Old School Fool Add to my Favorite Fools Ignore this person (you won't see their posts anymore) Number: of 23712  
Subject: Re: Altitude Training. Date: 11/10/2013 7:46 PM
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I wouldn't sweat it too much - just as an anecdotal data point, I was out in Denver about a year ago. The first day I barely felt it at all - I would say it was about day 3 til I started to feel a little depletion/winded/fatigue.

That's the way it works. There are a couple things going on there. When you first arrive you're not acclimated. You body doesn't have enough red blood cells, so you might feel a bit short of breath, but otherwise fine. But once you are at altitude for a period of time, your body starts to produce red blood cells, and that's the thing that makes you feel dragged down and fatigued.

For that reason, athletes who train at sea level, but compete at altitude like to either show up right before the race or train for a couple weeks to get fully acclimated.
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