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 ?
The youngster's appearance on the podium was probably the most popular in London - barring that of Rebecca Adlington - as she studies at Plymouth College, where former world 10m platform diving champion Tom Daley, also goes.
Tom Daley also won a shock gold in the 10metre platform diving while Keri-Anne Payne went one better than Beijing to take the 10kilometre open water title.
His medal was the only one of the night for Britain who concluded the competition with seven medals in the pool, including two golds - as well as world titles in the women's 10km open water and 10m platform diving, courtesy of 15-year-old Tom Daley.
Pac-10 Women's Championships: UCLA sophomore Tess Schofield captured the platform diving title, winning UCLA's first conference title of the meet with a score of 280.
There are two disciplines: One is platform diving and the other is a plunge for distance, the goal being to swim the farthest underwater after a dive.
Sydney 2000 offers the most comprehensive event listing for a multi-sports game ever, including 100m Sprint, 110m Hurdles, Hammer, Javelin, Triple Jump, High Jump, 100m Freestyle Swimming, Olympic Sprint Cycling, Skeet Shooting, Super Heavyweight Weight Lifting, 10m Platform Diving and Kayak K1 Slalom.
Tom Daley in the men's 10m platform diving, Mo Farah in the 5,000metres and Nicola Adams, right, in the women's boxing are in line for golds.
Viktor Minibaev of Russia competes during the men''s 10m platform diving final
Josh damaged his shoulder quite badly doing some platform diving, but he has been getting physio and said he feels great.
POSTER boy Tom Daley survived a desperately close call before scraping into today's finals of the men's 10m platform diving.
In the men's synchronised 10m platform diving competition the pair were in the gold-medal position after three dives.
At 15 Tom became the youngest diver to win a world title in men's platform diving in 2009 in Rome - cheered on by his flag-waving dad.

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