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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No, because carbon dioxide buildup would be a problem. Someone trying this would feel the ill effects of too much CO2 long before they had any significant impact from lowered oxygen levels.
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