Here is some interesting data: Blood oxygen concentration and heart rate during three cycles of Wim Hof hyperventilation and breath holding.
Total elapsed time 14 minutes. 3rd breath hold I went two minutes and bottomed out the blood O2 meter!
Method:
Followed "Guided Wim Hof Method Breathing" video on Youtube.
Used Wellue O2 Ring Blood Oxygen Monitor to measure blood oxygen. I tested several wrist spO2 monitors and this finger spO2 monitor is much faster and more accurate.
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