If I understand correctly, hypoxic training (done by endurance athletes) works by forcing the body to adapt to low oxygen concentrations, i.e., improve oxygen metabolism. For this, athletes go to higher altitudes or use special machines (“hypoxicators”) that change the air they are breathing.
Could a similar effect be achieved simply by being in a (small enough) closed room for a long enough time, such that the oxygen concentration is as low as desired?
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One of the quietest ways to accidentally *die* is to have a low oxygen environment in a small room.
This is because low oxygen isn’t immediately recognizable by our brain (we have good CO2 detectors to make us breathe, but bad O2 detectors), and once it does happen we lose enough of our coordination that *leaving* the low oxygen area doesn’t happen (or we just pass out).
Now, could it be safely done by controlling the air inside a room with a machine, making sure it’s just low O2 and not too low? Perhaps. But at that point might as well use the hypoxicator.
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