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.

0
Pro
49
Against

Evidence from Studies

Supporting (0)

0

Community contributions welcome

No supporting evidence found

Contradicting (1)

49

Community contributions welcome

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.