Quite a niche question - guess there aren't too many that have experience of altitude + UC.
The only thing I can compare it to is skiing - I always found the air much cleaner and my BMs became much firmer. In fact I think it was good for my UC being in a more healthy enviroment.
I only stayed at altitude for 10 days though and I'm not sure how high you are going to be. The average altitude I stayed at was approx 8000ft
Post Edited (wavey) : 1/31/2011 9:35:16 AM (GMT-7)