I read a study done on WWII bomber pilots a long time ago and the medical community was quite surprised at the slow heart rate. Of course they were spending almost half their life at altitude. I've spent 10-20,000 hours at about 2,000 meters, sometimes for over 12 hours and it sure didn't hurt. More and more I'm hearing of athletes spending nights in 'the tent'. Time at altitude in an unpressurized airplane has to be a plus.
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Aloha Bill
A man is wise, only to the extent that he is aware of his own ignorance. Bill Bonner '08
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