On: The science of mask-wearing hasn’t changed, so why have our expectations?

[phonypc]

Blood oxygen saturation is not informative in this context, and it's disconcerting to see medical professionals treat it like it is. You can hyperventilate until you pass out without your blood oxygen saturation changing.

[erentz → phonypc]

> Blood oxygen saturation is not informative in this context, and it's disconcerting to see medical professionals treat it like it is.

Watch the full video. CO2 is addressed.

> You can hyperventilate until you pass out without your blood oxygen saturation changing.

Passing out when you hyperventilate is from too little CO2 rather than “retention.“ The opposite of what is being claimed masks cause.

[phonypc → erentz]

I did watch the first video in full; the other link, and three others in another post only address blood oxygen. I made no claims about CO2.

I don't think wearing a mask will meaningfully affect the breathing of most people, but blood oxygen isn't meaningful in demonstrating as much.

Passing out from hyperventilation is a second order effect of hypocapnia; the proximate cause is cerebral hypoxia, despite the blood being saturated.