There is an over-the-counter product called BOOST OXYGEN. I bought me a can for around 18 semolians the other day and took it on a strenuous hike. I self-administered the recommended 3-5 snorts after topping out at a saddle, but noticed only a slight, barely perceptible positive effect. Similarly with later tests. I wanted a positive effect, so I might have felt what I wanted to feel. Interim conclusion: not worth the money. Later in the day it seemed to make no difference to my online bullet and blitz chess.
I'll continue the tests and see if my SpO2 (peripheral oxygen saturation) as measured by a portable pulse oximeter is improved. It is already at 97-98%.
Exercise maxim: No day without (exercise induced) oxygen debt!
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