Wim Hof breathing uses controlled hyperventilation to calm stress
Dutch extreme athlete Wim Hof, widely known as “The Iceman”, is famous for thriving in freezing conditions. He once swam 57.5 metres under ice on a single breath, spent 44 minutes submerged in an ice bath, and ran a barefoot half-marathon on snow above the Arctic Circle, feats that earned multiple Guinness World Records and global media attention. Hof attributes these accomplishments to a trio of practices he packages as the Wim Hof Method: cold exposure, mental focus and a distinctive breathing drill.
The breathing drill
The breathing component starts from a seated or lying position. Practitioners take 30-40 deep, rapid inhalations followed by relaxed exhales, then hold their breath on empty lungs until a clear urge to breathe returns. One deep “recovery” inhale is held for about 15 seconds to complete the round; three or four rounds are typical.
What it does in the body
Fast breathing flushes out carbon dioxide and saturates the blood with oxygen. When the subsequent breath-hold ends, a brief adrenaline surge is followed by a rebound in parasympathetic (“rest-and-digest”) activity, leaving many people feeling both calm and alert. A 2014 laboratory study showed that trained volunteers using this technique could raise adrenaline and dampen an induced inflammatory response, evidence that conscious breathing may influence autonomic and immune function.
Current evidence and caution
Early trials and systematic reviews suggest potential benefits for perceived stress and inflammatory markers, but findings on cardiovascular and athletic measures are mixed and limited by small sample sizes. Larger, longer-term studies are still needed. As the drill can cause dizziness or fainting, it should only be practiced while sitting or lying down, never while driving, standing in water or if pregnant, epileptic or suffering serious cardiac or respiratory illness.
Voluntary activation of the sympathetic nervous system and attenuation of the innate immune response in humans – Proceedings of the National Academy of Sciences (PNAS)
Researchers trained healthy men in Wim Hof breathing, cold exposure and meditation. When injected with bacterial endotoxin, trained participants produced a surge of adrenaline, higher anti-inflammatory cytokine IL-10 and markedly fewer flu-like symptoms than untrained controls, showing conscious control over autonomic and immune responses.
PLOS ONE – “Does the Wim Hof Method have a beneficial impact on physiological and psychological outcomes?” (13 March 2024)
Systematic review of nine trials finds promising anti-inflammatory effects but mixed results for exercise performance; overall evidence rated low to moderate, calling for higher-quality research.
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