The following resources provide some background towards the original Wim Hof method: https://pubmed.ncbi.nlm.nih.gov/24799686/ https://pubmed.ncbi.nlm.nih.gov/

The following resources provide some background towards the original Wim Hof method: https://pubmed.ncbi.nlm.nih.gov/24799686/ https://pubmed.ncbi.nlm.nih.gov/24799686/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9071023/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9071023/ https://www.youtube.com/watch?v=OpTG02x6w5o https://www.youtube.com/watch?v=OpTG02x6w5o https://www.youtube.com/watch?v=EWHRumILOOk https://www.youtube.com/watch?v=EWHRumILOOk In short, the breathing increases epinephrine (adrenaline), which causes a spike in anti-inflammatory cytokines, and decreases inflammatory cytokines such as TNF-a. It should be added that on the web I found several reports about increased tinnitus symptoms, which usually subside after the breathing is stopped, but for some it was permanent. This is why I am not doing it regularly, as I also get some ringing, but thankfully it was not permanent. Nevertheless, I find this very method very exciting. I am glad Radboud took a look into it. However, I would love to see clinical trials on the method at last.