Wim Hof Breathing

Wim Hof breathing tutorial by Wim Hof

There are interesting studies around Wim Hof Breathing.

For example study that showed that Autonomic nervous system and the immune system can be influenced voluntarily. (Here is a news story related to this study).

Also to note from the same study:

In the intervention group [Wim Hof Breathing], practicing the learned techniques resulted in intermittent respiratory alkalosis and hypoxia resulting in profoundly increased plasma epinephrine (adrenaline) levels. - study

Definitions for above quote

• Respiratory alkalosis is a condition in which the pH of the blood becomes too alkaline (greater than 7.45) due to a decrease in the partial pressure of carbon dioxide (CO2) in the blood.
• Hypoxia: the body is deprived of an adequate supply of oxygen.
• increased plasma epinephrine levels: there is a higher amount of epinephrine (also known as adrenaline) present in the blood.