Swimming

Swimming is the method by which humans (or other animals) move themselves through water. Swimming is a popular recreational activity, particularly in hot countries and in areas with natural watercourses. Swimming is also a competitive sport. There are many health benefits of swimming, yet basic swimming skills and safety precautions are needed to participate in water activities. ==Technique== The human body, being composed mostly of water, has nearly the same density as water. Thus, staying afloat requires only a slight propelling of water downward relative to the body, and transverse motion only a slight propelling of water in a direction opposite to the direction of motion, due to generally low hydrodynamic form drag. This propelling is typically accomplished by cupping the hands and using them as paddles, and by kicking the legs to push water away from the body. With practice, technique can convert a slow or average swimmer to at least a moderately fast swimmer. Since speed converts directly into distance, the same techniques that improve speed also aid one to move farther with the same effort. The torso and the legs should be kept as much as possible parallel to the surface of the water. Drooped legs or a slanted torso dramatically increase drag. Try to have a pointed hand above the head, pointed forward as much as possible. This increases the average length at the water-line, substantially increasing speed. This is an effect long used by boat designers, and unconsciously used by "naturally good swimmers." Try to maximize the time spent on the side because the torso is smaller front-to-back than side-to-side on most swimmers. This reduces the frontal cross-section, reducing drag further, and also increasing the ratio between the bodies water-line-length and width. Similar improvements are possible by orienting the narrowest direction of head, hands, legs and arms into the water. The torso is by far the most critical. The motion of the hand, arm, and leg from back to the front should be in the air as much as possible, and in the water, oriented as perfectly as possible, because the returning appendage has to move at least twice as fast as the swimmer, and in the water generates eight times the drag (drag increases with the cube of the speed) of an equal amount of torso frontal area. The basic "catch" of the water is not nearly as critical as the above items. Most swimmers simply grab water with their hand flat, or the fingers slightly spread, and then draw it smoothly down their body. Note that none of the above techniques require improved strength. With strength training, the hands and feet can be extended further into the water, gaining more propulsion. For beginners, increased strength brings only small improvements if the above strategies (minimise drag and lengthen water-line) are not optimal. A number of List of swimming styles have been developed based on the implementation of some or all of these principles. ==History== ''Main article: History of swimming'' Swimming has been known since prehistoric times. Drawings from the Stone Age were found in "the Cave of swimmers" near Wadi Sora (or Sura) in the southwestern part of Egypt. Written references date back up to 2nd millennium BC, including Epic of Gilgamesh, the Iliad, the Odyssey, the Bible (Ezekiel 47:5, Acts 27:42, Isaiah 25:11), Beowulf, and other sagas. In 1538 Nicolas Wynman, German language professor of languages, wrote the first swimming book "Colymbetes". Competitive swimming in Europe started around 1800, mostly using breaststroke. The front crawl, then called the ''trudgen'' was introduced in 1873 by John Arthur Trudgen, copying it from Native Americans. Swimming was part of the first modern 1896 Summer Olympics in 1896 in Athens. In 1902 the ''trudgen'' was improved by Richard Cavill, using the flutter kick. In 1908, the world swimming association FINA was formed. Butterfly was first a variant of Breaststroke, until it was accepted as a separate style in 1952. ==Competitive swimming== Competitive swimming is swimming with the goal to maximize performance, usually the speed of swimming. Competitive swimming became popular in the 19th century, and is an event at the Summer Olympic Games. Competitive swimming's international governing body is FINA, which includes local sub groups such as USA Swimming (USAS) and United States Masters Swimming (USMS) in the United States. FINA regulates four swimming disciplines, swum over different distances. *Freestyle swimming refers to "any style", and in competitive swimming places no restrictions on what action the competitors use, except during the freestyle portion of medley swimming. In practice, almost all freestyle events are swum using front crawl. Events are held at distances of 50 m, 100 m, 200 m, 400 m, 800 m and 1500 m. Events are held in yards at distances of 50 y, 100 y, 200 y, 500 y, 1000 y, and 1650 y. *Butterfly stroke events require that the swimmer's actions retain bilateral symmetry (the left side of the body has to do the same as the right). The butterfly is the most physically demanding of the four strokes. Events are held at distances of 50 m, 100 m, and 200 m. Events are also held in yards. *Breaststroke, from which the butterfly stroke evolved, places the additional restriction that the swimmer's hands must be pushed forward together from the breast and that the elbows must remain under the water. It is the slowest stroke in competitive swimming. Events are held at distances of 50 m, 100 m, and 200 m. This stroke, as well as butterfly requires great shoulder strength. Events are also held in yards. *Backstroke places no symmetry restrictions, but swimmers must lie on their back at all times except during turns to perform the stroke. Backstroke is performed, in essence, as an inversion of the crawl — competitors swing their arms back over their shoulder, alternately, and pull through under the water to provide motive power, with a flutter kick. Events are held at distances of 50 m, 100 m, and 200 m. Events are also held in yards. In the US all distances are swum in short course yards for NCAA and high school competition, except during Olympic years in which the NCAA championships are held in the short course meters format. Short course means that each length is 25 yards or meters. There are also world championships held in the short course meters format, however, it is not as publicised as the traditional long course (50 meters per length) world championships. The Olympic Games are competed exclusively in the long course meters format. World Championships are held each year, alternating between the traditional long course meters format and the less popular short course meters format. World records are tabulated separately for each event in both formats; world records are not recognized for the short course yards format. Backstroke and Freestyle are referred to as "long-axis" strokes because the body is in a much longer position than when performing breaststroke or butterfly, which are known as "short-axis" strokes. In addition to that there are a number of combination events in competitive swimming. *Relay, where a number of swimmers swim sequentially. Events are held at distances of 4×50 m freestyle, 4×100 m freestyle and 4×200 m freestyle. *Medley swimming, where one swimmer swims Butterfly, Backstroke, Breaststroke, and Freestyle in this order. Events are held at distances of 100 m (short course 25 m pools only), 200 m, and 400 m. *Medley swimming, where four swimmers swim Backstroke, Breaststroke, Butterfly, and Freestyle in this order. Events are held at distances of 4×50 m medley and 4×100 m medley. Full rules are on the [http://www.fina.org/swimrules.html rules web page] of FINA. Competitive swimming has traditionally been dominated by the United States, but recently that dominance has been challenged by Australia , where swimming is a hugely popular recreational activity, and participant and spectator sport. The success of Australian swimmers like Ian Thorpe, Michael Klim, Grant Hackett, and Kieren Perkins is reminiscent of Australia's previous golden age of swimming in the 1950s and 1960s, which saw the emergence of swimmers such as Shane Gould and Dawn Fraser, but for the moment the American swimmers led by Michael Phelps, Natalie Coughlin, Kaitlin Sandeno, and Kara Lynn Joyce will be able to hold off the Australians just like they did in the 2004 Olympics. There are also a number of other Competitive swimming performances, for example a Long distance swimming 5 kilometer open-water event, which became part of the Olympic program in 2000, or long distance swims across the English Channel, or circumnavigating Manhattan Island. The world record for the longest nonstop swim is held by Martin Strel for swimming 504km nonstop in 2001 in the Danube River. He also swam the Mississippi River in 2002 in 66+2days, a total of 3885km. The current holder of the most world records for long distance swimming is Vicki Keith. Swimming is also a crucial part of other sports, such as water polo, synchronized swimming, modern pentathlon and triathlon. (''See List of water sports'') ==Recreational swimming == The most common reason for swimming is probably recreation, where the swimmer enters the water merely for enjoyment. Many List of swimming styles are suitable for recreational swimming. Most recreational swimmers prefer a style that keeps their head out of the water and uses an underwater arm recovery, for example breaststroke, side stroke, or 'Dog paddle swimming', however, out-of-water recovery of freestyle or butterfly gives rise to better exploitation of the difference in viscosity of the two media (air and water). Butterfly, which consists of out-of-water recovery with even symmetry in body movements, is most suited to rough water swimming. For example, Vicki Keith crossed the rough waters of Lake Ontario using butterfly. Much of recreational swimming takes place in pools, where the water is calm. Therefore freestyle (which does not work as well in rough water) is suitable. However, playing around in rough water is a common source of recreation, but is sometimes dangerous due to undertow or the risk of injury from rocks on the bottom of a lake or riverbed. Swimming pools are popular venues for recreational swimming, as are beaches, lakes, swimming holes, creeks, rivers, and sometimes canals. ==Occupational swimming== A number of people enter the water and swim as part of their work. For example, abalone divers or pearl divers swim and dive to obtain an economic benefit, as do Spearfishing. Swimming is used to rescue other swimmers in distress. There are a number of specialized swimming styles specially for rescue purposes (''see List of swimming styles''). Such techniques are studied for example by Lifeguard, or members of the Coast Guard. The training of these techniques also evolved into competitions, as for example surf lifesaving. Swimming is also done for scientific research. Swimming is studied to improve the swimming performances of competitive swimmers. Swimming is also used in marine biology to observe plants and animals in their natural habitat. Other sciences may also use swimming. Konrad Lorenz for example swam with Goose as part of his studies of Ethology. Swimming also has Armed force purposes besides the mere need to cross waters. A swimmer in the water or under the water can be difficult to detect, especially at night. Military swimming is usually done by Special forces, as for example Navy SEAL. Swimming is used to approach a location, gather intelligence, sabotage, or combat, and to depart a location. This may also include airborne insertion into water or leaving a submerged submarine through a hatch or the torpedo tubes. Special equipment and techniques are also used to engage hostiles in and under water. Swimming more recently has become a professional sport as well. Companies such as Speedo and TYR Sports Inc. sponsor swimmers just as Nike, Inc. might sign contracts with basketball players. Also cash awards are given at many of the major competitions for breaking records. An example of a professional swimmer is Micheal Phelps who has a contract with Speedo. ==Swimming for exercise== Swimming is a good form of exercise. Because the density of the human body is approximately similar to water, the body is supported by the water and less stress is therefore placed on joints and bones. Furthermore, the hydrodynamics against movement depends heavily on the speed of the movement, allowing the fine tuning of the exercise according to ones ability. Therefore, swimming is frequently used as an exercise in rehabilitation after injuries or for the disability. Swimming is an aerobic exercise due to the relatively long exercise times, requiring a constant oxygen supply to the muscles, except for short sprints where the muscles work anaerobic exercise. As with most aerobic exercise it is believed to reduce the harmful effects of Stress (medicine). While aerobic exercises usually burn fat and help with losing weight, this effect is limited in swimming, even though being in cold water burns more food energy to maintain body temperature. The reason that swimming does not significantly reduce weight is still poorly understood, but seems to be related to the better heat conduction of water. A number of reasons are suspected. *First, water cools the body much faster than air, and most researchers believe that subsequently the body aims to maintain a layer of fat under the skin for insulation. *Secondly, it is believed that appetite decreases as your body temperature increases, as for example during exercise. However, during swimming the body is cooled down almost instantly as the surrounding water is usually cooler than the body temperature, and some researchers believe that this may actually increase the appetite. This assumption is not yet proven by research. *Finally, some researchers also believe that the metabolism of the body increases at higher body temperature, burning more food energy. Again, during swimming the body is cooled down by the surrounding water, reducing the metabolism, and subsequently the amount of food energy burnt. This assumption is also not yet proven by research. Swimming exercises almost all muscles in the body. Usually, the arms and upper body are exercised more than the legs. In competitive swimming, excessive leg muscles can be seen as a disadvantage as they consume more oxygen, which would be needed for the muscles of the arms. However, this depends on the swimming style. While breaststroke generates significant movement with the legs, front crawl propels the body mainly with the arms. Sometimes the swimming consists of swimming laps using a conventional stroke, such as the front crawl; other forms can include different forms of exercise performed in the water, such as aqua aerobics. ==Health risks== Swimming is considered a sport with a low risk of injury. Nevertheless there are some health risks with swimming. Most lethal risks in swimming are due to the inability to swim. It is recommended to swim in an area supervised by lifeguards and to pay attention to the water conditions. Possible health risks, ranging from potentially lethal to minor temporary inconveniences, are listed below: * Drowning can cause injury or death. ** Drowning due to adverse water conditions which may force the body under water or force water into the body. ** Drowning due to negative buoyancy, for example due to being attached to items heavier than water, e.g. medieval armour or a concrete block around the feet, or being trapped in an item heavier than water, e.g. a sinking ship. ** Drowning due to outside influence, as for example being pushed under water by another person by accident or intentionally. ** Drowning can also be caused by the inability to swim due to exhaustion or unconsciousness or a combination thereof. Besides other health risks listed below this may be due to effects unrelated to swimming as for example Myocardial infarction and other strokes. * Risks due to the effect of water on the human body. ** Secondary drowning, where inhaled salt water in the lungs after a near drowning starts to create a foam in the lungs that restricts breathing. ** Thermal shock after jumping into water can cause the heart to stop. ** Spending time in the water can give a wrinkled skin on the fingers, palms of the hands, and the soles of the feet. This disappears quickly without any negative effect. ** Injuries may heal slower if submerged in water. * Risks due to chemicals in the water. ** In chlorination swimming pools the chlorine may burn in the eyes. This stops shortly after leaving the water. Other disinfection techniques using, for example, ozone can avoid this effect. ** Breathing small quantities of chlorine from the water surface whilst swimming for long periods of time may have an adverse effect on the lungs. ** Chlorine also has a negative cosmetic effect on hair after repeated long exposure. * Risks due to bacterium, fungi and viruses in the water. Water is an excellent environment for many bacteria, which may affect humans. The risk and severity of infection vary with the water quality. A selection of more common infections related to swimming are: ** Swimming and showering can cause athlete's foot (boat bug). The easiest way to avoid this is drying the space between the foot after swimming. ** Swimming can cause ear infections in the ear canal (Otitis externa). ** Cases of Legionnaires' disease have been transmitted by improperly sterilized showers after swimming. Good swimming facilities heat the shower water to 60°C (140°F) once per week during closing time to disinfect the water system. ** There is no known case of transmission of AIDS through the water, nor is there a known case of pregnancy due to sperm transported through the water while swimming. * Risks due to physical activity in the water specific to swimming. ** Competitive swimmers may have a health risk due to overuse. Butterfly swimmers for example may develop some back pain and shoulder pain after long years of training, breaststroke swimmers may develop knee pain, and front crawl and backstroke swimmers may develop shoulder pain. ** Long term swimmers may occasionally get some abnormal growth in the ear due to the frequent water splashing of water in the ear canal. ** Shallow water blackout is a condition where holding the breath causes a sudden unconsciousness due to oxygen starvation (Asphyxia). ** Exhaustion due to long swims or bad physical shape can cause drowning. * Risks due to water and weather conditions. ** An outdoor swimmer can be hit by lightning during a thunderstorm. Lightning will usually hit the highest point available, as for example the head of a swimmer on a flat water surface. ** Strong winds can cause Ocean surface waves and can blow a swimmer away from land. ** Hypothermia due to cold water can cause rapid exhaustion and unconsciousness depending on the water temperature and the body conditions. ** Current_(water), including tides and rivers can cause exhaustion and can move a swimmer away from safety or pull swimmers under water. ** Due to the reflections in the water, the effect of the sun is more severe than on land, causing sunburn. Furthermore, swimming is usually done while exposing most of the body to sunlight, especially some areas usually covered (around the rims of the bathing suit) or in the shade (the back of the knees). In the long term this may increase the risk of cancer and decrease the aesthetics of the skin. * Risks due to other objects in the water. ** A collision with another swimmer or other object as for example the wall of a pool, rocks, and boats, especially the propellers thereof, may result in injuries. Severe injuries are possible after hitting an object while diving into the water. Injuries can also be caused by stepping on sharp objects, e.g. broken glass. ** Dangerous marine life can attack swimmers in self defense or for prey, often in combination with a poison. *** Marine life that sting, e.g. jellyfish and some corals. *** Marine life that pierce, e.g. sea urchins. *** Marine life that bites, e.g. sharks and other fish, snakes, or lobster and crabs. ==Clothing== The desire or cultural demand of modesty together with the awkwardness or unsuitability of conventional clothing in the water led to the development of the swimsuit (and in Victorian era times, the bathing machine). Men's swimsuits tend to be Trunks (clothing), surf or boardshorts, competition briefs, cut-offs, or jeans. Women's swimsuits are generally either one-piece swimsuits of traditional or competitive style (such as the racerback) or bikinis. Also there is the monokini, in case the coverage of the breasts is neither required nor desired. However, special swimsuits for competitive swimming, designed to reduce skin drag, can resemble unitards. (See Competitive Swimwear) Nude swimming is done: *at nudist areas **in Denmark, all beaches are clothing-optional unless marked otherwise *during nudist hours in some swimming pools *at (usually small) swimming pools in saunas *without being formally allowed, at quiet places and hours; also called ''skinny dipping'' *at private swimming pools and beaches, not visible for outsiders ==See also== *List of water sports *List of swimming styles *Sport *How to swim (From the ''Boy's Own Book of Outdoor Sports'' (early 1900s)) *List of Swimmers *List of swimming coaches *Swimming at the Summer Olympics *Total immersion ==External links== *[http://www.religiousbook.net/Books/Online_books/Pr/Practices_43.html Winter Swimming] Diving Survival skills Swimming simple:Swimming

Swimming

what is the word used for swimming naked. :I believe the term you're looking for is "skinny dipping". -- User:Hadal 09:54, 6 Mar 2004 (UTC) ---- Removed "Swimming in general is the flotation of an object in a liquid due to its buoyancy or lift" from the introduction. Surely that's "floating"? User:Mswake 23:31, 23 Apr 2004 (UTC) :Agree. Wasn't too excited about this when i edited the article, too. -- User:Chris 73 User talk:Chris 73 00:40, 24 Apr 2004 (UTC) ==Heat burns calories?== ''Secondly, in exercise many calories are burnt due to the increased body temperature (see: Perspiration). However, during swimming the body is cooled down almost instantly as the surrounding water is usually cooler than the body temperature, reducing the number of calories burnt.'' Seems a reversal, burning calories produces heat. I removed it. Please give a reference if you still think it is correct.--User:Patrick 08:02, 24 Apr 2004 (UTC) :I did some more research online. The exact reasons why swimming does not help in loosing weight are poorly understood. I found three possible reasons: :*The "insulating fat layer". This seems to be pretty certain to be one reason :*The appetite decreases as body temperature increases ([http://www.thefactsaboutfitness.com/research/swimming.htm], [http://www.mothernature.com/Library/Bookshelf/Books/34/22.cfm]). This is a new reason I added, although it is not yet proven (stated as unproven in the article page) :*Finally, the reason you removed, which I rephrased. The metabolism slows down in colder water/at a colder body temperature, subsequently burning less calories. For example, drowning children have survived up to 70 minutes under ice cold water, which can only be possible if the brain metabolism slows down to an almost stop. I also read about this related to swimming on two occasions, but both of them on paper, and I do not have an online reference. One occasion was during my swimming coach education classes. In any case, i stated it as unproven in the main article. :I rewrote the section. Hope this is an improvement, and that the above answers your questions. Let me know if you have any comments about it, and we can work it out. -- User:Chris 73 User talk:Chris 73 13:38, 24 Apr 2004 (UTC) ::Thanks, it is clearer now.--User:Patrick 20:28, 24 Apr 2004 (UTC) == Entering a pool or other place of bathing == User:66.167.138.174 02:56, 3 Jan 2005 (UTC): This section from the article has been moved here in case there are parts of it which are worth re-incorporating: Pools are ordinarily entered by way of stairs, or a ladder, to permit slow (gentle) entry that avoids splash or the risk of getting water in the ears or nose, for beginners. As bathers get more comfortable (and experienced) they often just jump into the water. Some children like to run along the pool deck, to increase the thrill factor of the jump, but many bathing complexes prohibit running, for safety reasons. Jumping into water from a high elevation, such as 1m, 3m, 5m, or 10m (in deep pools), and cliff-jumping into the waters of abandoned quarries, is another form of recreation. The sudden inrush of water provides an thrilling experience that children (of all ages, including their parents) often enjoy. Many facilities have cement platforms for a "fun swim" in which children of all ages can climb up a cement tower and jump into the pool from a height of 5m, and sometimes 10m. Cliff jumping at 20m is also a common form of recreation, but there are limits to heights of safe jumps, e.g. jumping off the Golden Gate Bridge at a height of 220 feet (66m) results in certain death, and is only done for purposes of suicide. Such jumps exceed the recreational limits of that the human body can withstand. Pools normally don't provide more than 10m height, as this is seen as the safe limit. Some pools, such as Woodbine Bathing Station/Summerville Olympic Pool have closed off the 10m height to children, for safety reasons. Entering the pool by stairs or ladder is gentle enough as not to get water in the nose, but entering from a greater height is often done head first, or if done feet first, the nose is often held shut with one hand. Earplugs are often used because of the impact and because the higher a person jumps from, the deeper they go, and the depth of the water causes pressure on the ears. When swimming to the end of a pool, one can stop, re-orient, and change directions but experienced swimmers flip around in a somersault fashion, so that they do not need to stop and hold onto the wall to change the direction of their bodies. In lane swims, there is usually one preferred side to enter the pool from, so that people do not jump on top of other bathers. For safety, it is important to have structure and care in the manner in which people enter the water, especially if from a raised area such as a starting block, springboard, or cement tower. Entry and exit from the baths is usually specified by lifeguards to keep the flow of traffic operating in a safe and efficient manner. == White Levis? == This whole paragraph sounds fishy, I don't see many other links to white levis being used for swimming... ''The famous 'top and levis' � a neoprene jacket and shrink-to-fit Levis remains one of the best diveskins, offering protection from overexposure to the sun, stings, and abrasion. Levis 501, 505 and 512 Red Tab have a hydrodynamic fit for swimming and diving. Levis have been featured in a variety of under-water commercials: The Mermaid, The Levis Swimmer, The French Dictionary, and numerous beach commercials in the 1990's. Advertised as 'your second skin', Levis are considered by intrepid swimmers and divers to be an extension of their aquatic body, and became popular starting in the 1960's with the famous 'white levis' worn by surfers. '' User:SimonLyall 10:40, 7 Mar 2005 (UTC) :Now that you mention it... yeah! I have removed the paragraph. -- User:Chris 73 User talk:Chris 73 10:54, Mar 7, 2005 (UTC) ==Legionnaires disease== Moved from article: :The sentence on Legionnaires disease is inaccuarate. I was an author of the first scientific article describing the showering link to Legionnaires' disease (Cordes Ann Internal Med 1980). The study was flawed and 5 case-control studies show that showering is NOT linked to Legionnaires disease. Moreover our research group devised the heat and flush method for legionella disinfection (Best, Lancet 1983). It is unnecessary for swimming facilities. For more info, go to the FAQ on the home page of www.legionella.org . Victor L Yu (victorlyu@yahoo.com, 412-688-6643, office phone) User:Niteowlneils 07:03, 17 Mar 2005 (UTC) : I agree that this passage needed to be removed from the article, but if the information on Legionnaires is inaccuarate as claimed it should be removed from the article as well. User:Tkessler 23:31, Mar 19, 2005 (UTC)

Swimming

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