STOP WEARING ELEVATION MASKS
They don’t mimic high altitudes.
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Then, when mountain-dwellers head back down to sea level, the higher oxygen-to-blood ratio ups their VO2 max, which makes intense workouts (including races) feel easier. Some people try to get the same benefits by wearing elevation masks at sea level.
A 2016 study found that training in elevation masks for six weeks had no effect on VO2 max, and 2017 research showed that people’s VO2 max improved after six weeks of HIIT regardless of whether they wore a mask or not.