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 ?
Reef Divers is acclaimed for its one-of-kind valet diving service where divers can relax and let the dive team do all the work, providing a carefree, concierge experience.
The transparency, clarity and temperature of our waters, the quality of diving services provided, as well as lodging and boarding services, safety conditions and treatment facilities in case of accident, can help designate Cyprus as an important diving destination in the Mediterranean," Papachristodoulou said.
The Atlantis dive discovery, which costs Dh1,150, is an introductory diving experience which gives new divers a basic skill session before a 20-minute dive in the Ambassador Lagoon.
However, given the tragic death of Ghezala, there are issues that need to be addressed regarding diving and the discipline it requires.
Dive Master have also supported the work of the DDRC, the Diving Diseases Research Centre, sponsoring their first Diver Medic Book, as well as other publications, including their Survey of Scuba Diving for Disabled Divers.
Diving in Swansea A fantastic option for those wanting to get a taste of diving, this day experience in Swansea uses a safe open water site, under the watchful supervision of qualified instructors.
Guests can enjoy a variety of accredited PADI courses from the basic Discover Scuba Diving programme to the Open Water Diver qualification to the more advanced Assistant Instructor courses for those wanting to pursue a career in diving.
It requires all members of the team to be versed on diving procedures, maintenance, administration, applicable diving instructions and policies.
The Professional Association of Diving Instructors (PADI) has developed dive education programmes specifically for children aged 8-12 years which are conducted in the confined waters of a swimming pool and allow youngsters to experience the thrill of diving safely, participating in a variety of activities such as diving at night and taking photographs underwater, all under direct professional instruction.
Last year's NEC Dive Show attracted more than 16,000 divers in search of UK and overseas dive trips, new kit, the latest equipment and training opportunities, or simply a great day out catching up with diving friends.
For sport divers wearing ordinary diving masks, the greatest mean risk was seen in freshwater recreational waters, where there was a 1.
I had flashbacks of that "hostage" event when I read the story about a lieutenant commander who was scuba diving with a group off a charter boat.