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The diving reflex is a set of physiological responses that occur in response to cold water immersion, particularly when the face or body is exposed to cold water. It is an evolutionary adaptation that helps mammals , including humans, manage the challenges of being submerged in cold water.
In humans, the diving reflex is not induced when limbs are introduced to cold water. Mild bradycardia is caused by subjects holding their breath without submerging the face in water. [ 10 ] [ 11 ] When breathing with the face submerged, the diving response increases proportionally to decreasing water temperature. [ 8 ]
The diving reflex is a response to immersion that overrides the basic homeostatic reflexes, and which is found in all air-breathing vertebrates. [6] [7] It optimizes respiration by preferentially distributing oxygen stores to the heart and brain which allows staying underwater for extended periods of time.
Humans set breath-holding records in water because they "can hold their breath twice as long underwater they can on land." The world record is 19 minutes and 30 seconds. It depends--but you can ...
Submerging the face in water cooler than about 21 °C (70 °F) triggers the diving reflex, common to air-breathing vertebrates, especially marine mammals such as whales and seals. This reflex protects the body by putting it into energy-saving mode to maximise the time it can stay underwater.
Cave diving, wreck diving, ice diving and diving inside or under other natural or artificial underwater structures or enclosures are examples. The restriction on direct ascent increases the risk of diving under an overhead, and this is usually addressed by adaptations of procedures and use of equipment such as redundant breathing gas sources ...
During the diving reflex, the infant's heart rate decreases by an average of 20%. [1] The glottis is spontaneously sealed off and the water entering the upper respiratory tract is diverted down the esophagus into the stomach. [6] The diving response has been shown to have an oxygen-conserving effect
Cold water dousing is used to "shock" the body into a kind of fever. The body's reaction is similar to the mammalian diving reflex or possibly temperature biofeedback. Several meditative and awareness techniques seem to share similar effects with elevated temperature, such as Tummo. Compare cold water dousing with ice swimming.