Hi Ben,
I measured it with a device attached on my finger. It use spectromeatry to determine the saturation of oxigen in blood. Do you think there is a wrong place to measure O2 level? 11% sounds very low for me...it is possible to use another reference for the satturation(?).What I can say by my own, is that in the first two minuts the level decrese very slow,(to 90% or something) then in the third minute it decrese to 80%, mostly in the last 20 seconds, when I have experienced strong contractions. Also I saw that the hart rate was increesed during contraction, and it should be the reason for the accelerated O2 level decrees. It will be interested a graphic with relations between time(and contractions moments) , O2, hart rate ...maybe I'll do it next time..
