diving reflex

noun

, Physiology.

1. a reflex of humans, other mammals, reptiles, and birds, triggered by immersion in cold water, that slows the heart rate and diverts blood flow to the brain, heart, and lungs: serves to conserve oxygen until breathing resumes and to delay potential brain damage.

Word History and Origins

Origin of diving reflex¹

First recorded in 1975–80

Example Sentences

Holding your breath and submerging your face in cold water can trigger the “diving reflex,” a response that slows the heart beat and constricts blood vessels.

From New York Times

Think of activating your diving reflex as a way of channeling your inner dolphin.

From Washington Post

This activates the diving reflex, which slows the heart rate and redirects blood away from the periphery of the body, toward the heart and other vital organs.

From Washington Post

We share the diving reflex with other air-breathing vertebrates.

From Washington Post

Even if you don’t believe me, your body does: every vertebrate mammal has what’s known as the mammalian diving reflex, which is a suite of physiological changes that happen to your body when your face is submerged and your nostrils fill with water.

From The Verge