Originally Posted by
Carbonfiberboy
It's hard to make out what you are interested in from your post. Do you want to train to perform better at altitude, like climbing or biking over passes? Or are you trying to modify your whatever so you can perform better near sea level?
As I understand it (and someone correct me if I'm wrong) athletes train at altitude in order to increase their aerobic capacity; this is because the oxygen is at a lower concentration than at sea-level. Therefore, the body must become more efficient at using avaliable oxygen. So if you only breath through your nose during aerobic activity the thinking is that your lungs will receive less oxygen forcing your body to become more efficient.
It's about improving my aerobic capacity at sea-level.