Thread: lung issues
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Old 02-03-2009, 05:04 PM   #4
Steven Low
Senior Member
Join Date: Mar 2007
Posts: 3,045

Hard intervals compromise the immune system because it goes to repair the muscular damage caused by exercise.

I've recently came down with 2 bugs after some not-so-hard intervals (but I am out of lower body shape), so IMO that's probably what's going on. You just need to build up slower and let your body adapt to the hard stress.
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