diving

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diving

the act of work or recreation in an underwater environment. The main health effects are related to the increased pressure to which the person is subjected as the ambient pressure generally increases by 1 atm (14.7 pounds per square inch) for each 33 feet of descent below the water surface. Conditions that warrant caution about diving include obesity, diabetes, alcoholism, epilepsy, drug abuse, and respiratory disorders, including allergic rhinitis. See also decompression sickness, diving reflex.

diving

(1) diving in swimming pools carries the potential hazard of neck injury, if the dive is too steep relative to the depth of the water; (2) in scuba diving the diver breathes compressed air from a cylinder, through a face mask and a closed system of tubes ('self-contained underwater breathing apparatus'). Pressure increases by 1 atmosphere (1 bar) per 10 metres of depth. Below 30 m the 'intoxicating' effect of nitrogen narcosis is a danger, avoided by the use of helium-oxygen mixtures. Hypothermia is also a hazard in cold climates; (3) in breath-hold diving the duration of immersion can be increased if the dive is preceded by vigorous hyperventilation. This depletes carbon dioxide in the body so that it will take longer to rise to the level which would normally trigger the break-point, but oxygen in the lungs and the blood can be depleted to the point of threatening consciousness. See also barotrauma, cervical spine, decompression illness.

diving

the act of submerging underwater; diving by fish and amphibians creates an obvious need for mechanisms that allow them to be submerged under water for long periods. Most mammalian and avian orders also have aquatic species that have a similar need. Diving reflexes operate as soon as nostrils are submerged and include oxygen conservation, respiratory arrest, intense peripheral vasoconstriction, bradycardia and compression of the chest with almost complete evacuation of the lungs.
References in periodicals archive ?
Not for us cliff-diving in Acapulco, or a trek across the Serengheti (naturally, these are the kinds of holidays we enjoyed before little Isobel came along); instead, we decided that France was just far enough to seem adventurous without leaving us wondering what the Zulu word for ``nappy'' was.
market with vehicles joyously cliff-diving and leaping into the sea as they made their way from Italy to the U.
In Europe you could try Gozo, Malta's pretty neighbour, which is becoming popular for its cliff-diving and so-called "swim-throughs" where you can explore underwater arches and caves.
market with a new commercial that features vehicles joyously cliff-diving and leaping into the sea as they make their way from Italy to the U.
Achill based Garda Martin Kelly told the coroner that cliff-diving was usually practised at high tide when there was a large swell.
During season two, they smash and crash to develop potentially life-saving mechanisms like an unsinkable car, a portable submarine and a cliff-diving car.