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Swimming induced pulmonary edema (SIPE), also known as immersion pulmonary edema, is a life threatening condition that occurs when fluids from the blood leak abnormally from the small vessels of the lung (pulmonary capillaries) into the airspaces (alveoli).
The arm movements of the front crawl provide most of the forward motion. Various studies have shown that very small changes in the arm stroke can impact propulsive efficiency. For example, position of fingers: "Most studies concluded that a small finger spread leads to increased propulsive forces.
Also the arms can be lifted out of the water and pulled backwards together with a scooping movement. Alternatively, the arms can be raised behind the head, alternately or together pushing with the hands, propelling the body. Similarly, the hands can be brought together in a clapping action. These strokes are often used for training.
York recalls an incident in which she herself had difficulty swimming, despite her experience, while having chest pains in the water. Her advice: Swim where a lifeguard (or other people) are ...
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To an untrained observer, it may not be obvious that a drowning person is in distress. The victim may appear to be swimming safely, but the victim is actually within 20–60 seconds of sinking under the surface and thus dying. [3] They extend their arms laterally and press down on the water's surface in order to lift their mouth out of the water.
Freediving blackout, breath-hold blackout, [1] or apnea blackout is a class of hypoxic blackout, a loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold (freedive or dynamic apnea) dive, when the swimmer does not necessarily experience an urgent need to breathe and has no other obvious medical condition that might have caused it.
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