How can you pressure breathe through your nose? I can't quite grasp the concept.
Tighten your diaphragm and expel the air. Imagine blowing a candle through the nose.
Interesting. Do you do much, if any, endurance exercise at sea-level (the kind that would regularly bring your heart rate to 150 or so)? Do you have any idea what your pulse was when you were starting to get light-headed?
I climb Black mountain (San Diego) regularly and push my HR to 160+ whenever I do. I occasionally run too. But, even when I am hyperventilating at sea-level doing these workouts, my O2 reading doesn't go below 98%. On the other hand when I was feeling light headed, although my HR was around 110s (of course I took my readings after I came to rest) I really paid attention only to my low O2 reading.
Is Old Army Pass snow-free already?
There was a small 30-40ft section just nearing the Old army pass. But, I didn't need to wear any spikes although I carried one.
