Effects of cyclic hyperventilation?

Cyclic hyperventilation, often involved in practices like Wim Hof or Tummo breathing, has several notable effects. It's particularly characterized by removing a significant amount of carbon dioxide from the body, which lowers the impulse to breathe. This can extend the breath-hold phase after hyperventilation, reducing feelings of anxiety and the impulse to breathe during this period. The practice increases autonomic arousal and adrenaline levels, which, while initially increasing stress, helps individuals learn to manage heightened arousal deliberately. Key benefits include learning self-induced stress inoculation and the ability to maintain calm during adrenaline surges. Yet, there are cautions, especially for individuals with tendencies towards anxiety or panic attacks, and practicing near water due to the risk of shallow water blackout 1.

This breathing technique can lead to physiological changes, including increased alertness, temperature, and in some studies, immune function benefits. It’s associated with deliberate cold exposure, with potential implications for improved immune responses to bacterial infections 2.

However, cyclic hyperventilation can lead to hyperexcitability and decreased sensory perception due to reduced CO2 levels, which impair oxygen delivery to the brain 3. Therefore, it’s advised that these exercises are approached with caution, especially by those with a predisposition to anxiety or panic disorders 4.