Climber
Well-known member
I'm pretty sure that restricted breathing does not simulate altitude. Masks train your lung muscles, which isn't the issue with altitude. First source found: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4879455/
The problem with altitude is the air is less dense, so each lung-full contains less oxygen. And theres less pressure to force that oxygen into your bloodstream. These problems shouldn't exist with masks. If you can get full lungs while wearing a mask, you are getting the normal "dose" of oxygen.
It reduced the rate that I could breath in the air, believe me I was definitely operating on reduced oxygen. As I said, I had to fight a threatening panic with my body as it definitely wanted more oxygen.
I understand what you're saying, but if you're not replacing the air in your lungs rapidly enough, then the partial pressure of the oxygen in your lungs will be reduced as your lungs remove the oxygen and replace it with carbon dioxide.