Do they? and how effective are they?
Do they? and how effective are they?
no
Altitude tents work, oxy debt marks do not.
anything to show me they do work? and how?
no
oxygen debt masks work by creating a void space around your mouth. it creates a pocket where exhaled gas sits. so when you breathe in, you get some of that instead of 100% air.
and no, they aren't a useful training tool. just run faster
there is no equivalent to running at altitude by wearing a mask.
altitude tents are another story
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