huh. I've watched my wife hold her breath to drive down the spo2 while using the pulse ox, just for fun. but even when I'm at the end of a breath singing, it still says 99-100. so there is actually something weird going on there. (when I checked the other day my spo2 was normal but my bp was low when I was having to breathe extra to get by.)
except I just reran the experiment and it dropped to 93 and stayed low for half a verse of not singing. so that's also weird. it also frequently reads much lower initially no matter which machine is getting used so idk if that's normal or not. and then running it again for two songs after a song off it didn't really dip at all until the second verse of the second song at the beginning of a phrase?
it doesn't seem to directly tie to my breathing at all? I tried just straight holding my breath like I've seen her do and it barely moved. even when my nails and tongue are visibly purpled and not due to cold it says my o2 is fine.
idk bro there's something up with all that but it doesn't readily show up on the machines so everyone just shrugs and moves on. my mom's spo2 never dips much even when she needs her nebulizer cuz her are so constricted.