causal
Analysis v1
Strong Opposition
When you breathe oxygen-poor air through a mask for only 5 minutes before lifting weights, your blood oxygen level drops more than when you’re at real high altitude—even if the air has the same oxygen content.
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49
Evidence from Studies
Supporting (0)
0
Community contributions welcome
No supporting evidence found
Contradicting (1)
49
Community contributions welcome
49
The study looked at two types of low-oxygen environments during exercise but never measured the actual oxygen levels in the blood, so we can't tell if one type lowers oxygen more than the other like the claim says.