Andrew Huberman· PhD
Studies have shown and this is from Denmark studies from Bia hospital um that when you submerge into cold water up to the neck at Z degrees um you will have a decreased blood flow to the brain by around 30 to 40%
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Studies have shown and this is from Denmark studies from Bia hospital um that when you submerge into cold water up to the neck at Z degrees um you will have a decreased blood flow to the brain by around 30 to 40%
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when the sympathetic nervous system gets activated uh blood flow is maintained to the heart to keep you alive but obviously taken away from the brain to keep you from thinking