This is not any scientific/medical type info.........just FOG stuff. Real quick. When I was in the 10TH, out of Bad Toelz, we were sent to alllllllllll sorts of elevations in some of the various Alps, of this and that country. When I got out, I'd take vacations to CO (before I moved there in '82). Most times it was a straight drive to Summit County from Chicago. An elevation change of somewhere between 600' and 9600'. Next morning, I was out skiing all day. Sometimes XC..... sometimes downhill. I saw High Altitude Sickness.........Granted we are all different, but most of it was mental, just like sea sickness. (Have fun stories about that too). There are some that just plain can't cope with a change of altitude, Beyond the mental thang, just physiologically.
Most can! If they direct thier mind to control thier body......
By the way. When you head up to altitude...... one's urine will be dark yellow to brownish. As stated earlier drink aaaaaaaaaalot of water. I drank alot of other stuff, but don't want to recommend what I did. (Upsidedown Margaritas were fun)
What I'm saying............. is most that crap, is in one's mind. THAT can be beat. With the internet, a person can research the living hell out of any subject. Well, that info you read is 'GIGO". Some, scientificaly sound....... So what??? It was in my day as well, longgggggg before the NET. Go do whatever you want and quit thinking so hard!!!!!!!!!
