How Cold Water Slows Heart Rate & Boosts Oxygen

About this video

Huberman’s guest explains the mammalian dive response triggered by holding your breath with your face in cold water. She explains that heart rate slows and blood vessels in the extremities constrict so blood and oxygen stay central for the brain, while the spleen contracts and pushes its reservoir of oxygen-carrying red blood cells into circulation. She puts the resulting oxygen boost at about 10% in most people, which Huberman calls enough to make a difference.

Key takeaways

• The guest explains breath-holding with the face in cold water triggers a dive response that slows heart rate.
• The guest describes the spleen contracting to release oxygen-rich red blood cells, giving about a 10% oxygen boost in most people.

Episode details: published May 26, 2025 · 260.1K views · 0:53 long. Summary written by Self Growth Videos from the episode itself. The science and protocols described are Andrew Huberman’s, presented for education — not medical advice. Consult a qualified professional before changing your own health practices.

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