Child post posed question about what measurement is being used to decide whether or not to give breathe notification, I googled around and saw that it's not documented as you say, but I think it's Apple being coy and secretive here, there's definitely something going on here.
My guess is it's some combination of pulse reading and lowered blood oxygenation level. The blood oxygenation measurement is probably more highly weighted.
When we are stressed out, we start taking shallow breaths, and taking shallow breaths is bad because it's then we start to lose a balance of oxygen/CO_2, and when that happens we're not at your best, we feel dizzy, we feel tired, our judgement is perhaps not optimal, so this is the right time to take a moment to relax and inhale deep to get some good air in, and exhale exhaustively and repeat a couple of times.
For my part the notifications seem almost completely random except that they come when I’m sitting down. I have not noticed them happening when I’m particularly stressed. You’ll notice in the app that you can specify how many notifications you get per day, further suggesting that it’s not tied to stress indicators in vital signs.
> You’ll notice in the app that you can specify how many notifications you get per day, further suggesting that it’s not tied to stress indicators in vital signs.
You make a very compelling point that an option of choosing how many times you get notified is suggestive of it being random/unrelated to vital signs, and I actually didn't know you could set this (I see now mine is set to 2 times a day).
But I still maintain it's more than that, it does use some measurement to trigger a notification, and the max limit exists so as to not burden the user with these notifications lest they start becoming a source of stress themselves.
The reason I'm so strongly convinced of this is that I seem to almost be able to trigger it in a sense, this all first got to me when I realized that notification would appear when I thought about something particular in a certain way during a rough time. Anyway, I'll be paying extra attention to this now and will report back with results after a couple of days! :)
Child post posed question about what measurement is being used to decide whether or not to give breathe notification, I googled around and saw that it's not documented as you say, but I think it's Apple being coy and secretive here, there's definitely something going on here.
My guess is it's some combination of pulse reading and lowered blood oxygenation level. The blood oxygenation measurement is probably more highly weighted.
When we are stressed out, we start taking shallow breaths, and taking shallow breaths is bad because it's then we start to lose a balance of oxygen/CO_2, and when that happens we're not at your best, we feel dizzy, we feel tired, our judgement is perhaps not optimal, so this is the right time to take a moment to relax and inhale deep to get some good air in, and exhale exhaustively and repeat a couple of times.