Wearing a Mask During Exercise

I wanted to ask if anyone has come across any recent studies in regards to exercising while wearing a mask (like a surgical mask). I am looking for something that shows oxygen levels while wearing a mask and carbon dioxide levels as well. I know gyms across the nation are starting to make masks mandatory to work out and the idea seems medically unsafe but would rather see an actual study rather than just use logic. Any input would be appreciated. Thank you.

This might be a better question for the T Nation forums. Please feel free to repost there.


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