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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You would have to constantly monitor the proportion of CO2 to O2, which is non-trivial to do in a safe way, then vent or add in gas to compensate (and make sure it’s getting to the person). Meanwhile the room needs to be big enough that you can do things in it, while still being relatively airtight. Finally, your body reacts differently to high CO2 air than it does low O2 density air (like being at high altitudes). So with all that expense and engineering, it’s easier to just rent a place in the mountains.
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