Swimming times have dropped over the years due to better training techniques and to new developments.

In the first four Olympics competitions were not held in pools, but in open water (1896- The Mediterranean, 1900- The Seine River, 1904- an artificial lake, 1906- The Mediterranean). The 1904 Olympics' freestyle race was the only one ever measured at 100 yards, instead of the usual 100 meters. A 100 meter pool was built for the 1908 Olympics and sat in the center of the main stadium's track and field oval. The 1912 Olympics, held in the Stockholm harbour, marked the beginning of electronic timing.

Male swimmers wore full body suits until the 1940s, which caused more drag in the water than their modern swim-wear counterparts. Competition suits now include engineered fabric and designs to reduce swimmers' drag in the water and prevent athlete fatigue. Also, over the years, pool designs have lessened the drag. Some design considerations allow for the reduction of swimming resistance, making the pool faster. Namely, proper pool depth, elimination of currents, increased lane width, energy absorbing racing lane lines and gutters, and the use of other innovative hydraulic, acoustic and illumination designs.

The 1924 Olympics were the first to use the standard 50 meter pool with marked lanes. In the freestyle, swimmers originally dove from the pool walls, but diving blocks were incorporated at the 1936 Summer Olympics. The flip-turn was developed by the 1950s. In addition, a split stroke in the breaststroke start and turns have been added to help speed up the stroke.

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Recreational swimming

The most common purpose for swimming is recreation. Recreational swimming is a good way to relax, while enjoying a full-body workout. Several swimming styles are suitable for recreational swimming; most recreational swimmers prefer a style that keeps their head out of the water and has an underwater arm recovery. Breaststroke, side stroke, head up front crawl and dog paddle are the most common strokes utilized in recreational swimming, but the out-of-water arm recovery of freestyle or butterfly gives rise to better exploitation of the difference in resistance between air and water.

The butterfly stroke, which consists of out-of-water recovery with even symmetry in body movements, is most suited to rough water swimming. For example, in a record-setting example of endurance swimming, Vicki Keith crossed the rough waters of Lake Ontario using butterfly. Most recreational swimming takes place in swimming pools, and calm natural waters (sea, lakes, rivers), therefore front crawl is suitable.

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Occupational swimming

Some occupations require the workers to swim. For example, abalone divers or pearl divers swim and dive to obtain an economic benefit, as do spear fishermen.

Swimming is used to rescue other swimmers in distress. In the USA, most cities and states have trained lifeguards, such as the Los Angeles City Lifeguards, deployed at pools and beaches. There are a number of specialized swimming styles specially for rescue purposes (see List of swimming styles). Such techniques are studied by lifeguards or members of the Coast Guard. The training for these techniques has also evolved into competitions such as surf lifesaving.

Swimming is also used in marine biology to observe plants and animals in their natural habitat. Other sciences use swimming, for example Konrad Lorenz swam with geese as part of his studies of animal behavior.

Swimming also has military purposes. Military swimming is usually done by special forces, such as Navy SEALS. 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 exiting a submarine while it is submerged. Due to regular exposure to large bodies of water, all recruits in the United States Navy, Marine Corps, and Coast Guard are required to complete basic swimming or water survival training.

Swimming is also a professional sport. Companies such as Speedo, TYR Sports, Arena and Nike sponsor swimmers who are at the international level. Cash awards are also given at many of the major competitions for breaking records.^{[citation needed]}

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Swimming as exercise

Swimming is an excellent form of exercise. Because the density of the human body is very similar to that of water, the body is supported by the water and less stress is therefore placed on joints and bones. Swimming is frequently used as an exercise in rehabilitation after injuries or for those with disabilities.

Resistance swimming is one form of swimming exercise. It is done either for training purposes, to hold the swimmer in place for stroke analysis, or to enable swimming in a confined space for athletic or therapeutic reasons. Resistance swimming can be done either against a stream of moving water (often termed a swimming machine) or by holding the swimmer stationary with elastic attachments.

Swimming is primarily an aerobic exercise due to the long exercise time, requiring a constant oxygen supply to the muscles, except for short sprints where the muscles work anaerobically. As with most aerobic exercise swimming is believed to reduce the harmful effects of stress. Swimming can improve posture and develop a strong lean physique, often called a "swimmer's build." Muscle development depends upon the stroke and distances trained, but avid swimmers typically have well-developed triceps, upper backs, deltoids, and as well as quadriceps.

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The risks of swimming

Swimming is a healthy activity and enjoys a low risk of injury compared with many other sports. Nevertheless there are some health risks with swimming, including the following:

• Drowning, inhalation of water arising from
  • Adverse water conditions swamping or overwhelming the swimmer or causing water inhalation.
  • Actions of others pushing under water accidentally in play or intentionally.
  • Exhaustion or unconsciousness.
  • Incapacitation through shallow water blackout, heart attacks, carotid sinus syncope or stroke.

• Adverse effects of immersion
  • Secondary drowning, where inhaled salt water creates a foam in the lungs that restricts breathing.
  • Salt water aspiration syndrome.
  • Thermal shock after jumping into water can cause the heart to stop.
  • Exostosis which is an abnormal growth in the ear canal due to the frequent, long-term splashing of water into the ear canal. (Known as Swimmer's ear.)

• Exposure to chemicals
  • Disinfectant Chlorine will increase the pH of the water, if uncorrected the raised pH may cause eye or skin irritations. [1]
  • Chlorine inhalation; breathing small quantities of chlorine gas from the water surface whilst swimming for long periods of time may have an adverse effect on the lungs, particularly for asthmatics. This problem may be resolved by using a pool with better ventilation, with an outdoor pool having the best results.
  • Chlorine also has a negative cosmetic effect after repeated long exposure, stripping brown hair of all color, turning it very light blonde. Chlorine damages the structure of hair, turning it "frizzy." Chlorine can dissolve copper which turns blonde hair green. Proper pool maintenance can reduce the amount of copper in the water, while wetting the hair before entering a pool can help reduce the absorption of copper.
  • Chlorine will often remain on skin in an anhydrous form, even after several washings. The chlorine becomes odorous once it is back in an aqueous solution (when salivated on, during a shower, etc.).

• Infection
  • Water is an excellent environment for many bacteria, parasites, fungi and viruses affecting humans depending on water quality.
  • Skin infections from both swimming and shower rooms can cause athlete's foot (boat bug). The easiest way to avoid this is to dry the space between the toes. [2]
  • Microscopic parasites such as Cryptosporidium can be resistant to chlorine and can cause diarrheal illness when swimmers swallow pool water.
  • Ear infections, otitis media, (otitis externa).
  • When chlorine levels are improperly balanced, severe health problems may result, such as chronic bronchitis and asthma.
• Swimmer's own actions
  • Overuse injury; competitive butterfly stroke swimmers for example may develop some back pain, including vertebral fractures in rare cases, and shoulder pain after long years of training, breaststroke swimmers may develop knee pain, and hip pain, and freestyle and backstroke swimmers may develop shoulder pain, commonly referred to as swimmer's shoulder (a form of tendinitis).
  • Hyperventilation in a bid to extend underwater breath-hold times lowers blood carbon dioxide resulting in suppression of the urge to breathe and consequent loss of consciousness towards the end of the dive, see shallow water blackout for the mechanism.

• Adverse water and weather conditions
  • Currents, including tides and rivers can cause exhaustion, can pull swimmers away from safety, or pull swimmers under water.
  • Wind enhances waves and can blow a swimmer off course.
  • Hypothermia, due to cold water, can cause rapid exhaustion and unconsciousness.
  • Sunburn severity can be increased by reflections in the water and the lack of clothing worn during swimming. Long-term exposure to the sun contributes to risk of skin cancer.

• Objects in the water
  • Propeller damage is a major cause of accidents, either by being run over by a boat or entanglement on climbing into a boat.
  • Collision with another swimmer, the pool walls, rocks or boats.
  • Diving into a submerged object, or the bottom, often in turbid water.
  • Snagging on underwater objects, particularly submerged branches or wrecks.
  • Stepping on sharp objects such as broken glass.

• Aquatic life
  • Stings from jellyfish and some corals.
  • Piercings caused by sea urchins, zebra mussels, stingrays.
  • Bites from sharks and other fish and snakes, and pinches from lobsters or crabs.
  • Electrocution from electric rays and electric eels.

Organizations publish safety guidelines to help swimmers avoid these risks.^[6][7][8]

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Swimming lessons

Children are often given swimming lessons, which serve to develop swimming technique and confidence. Children generally do not swim independently until 4 years of age.^[9]

In Sweden, Denmark, Norway and Finland, the curriculum for the fifth grade states that all children should learn how to swim as well as how to handle emergencies near water. Most commonly, children are expected to be able to swim 200 metres (220 yards) – of which at least 50 metres (55 yards) on their back – after first falling into deep water and getting their head under water. Even though about 95 percent of Swedish school children know how to swim, drowning remains the third most common cause of death among children.^[10]

In both the Netherlands and Belgium swimming lessons under school time (schoolzwemmen, school swimming) are supported by the government. Most schools provide swimming lessons. There is a long tradition of swimming lessons in the Netherlands and Belgium, the Dutch translation for the breaststroke swimming style is even schoolslag (schoolstroke). The children learn a variant of the breaststroke which is technically not entirely correct.

In many places, swimming lessons are provided by local swimming pools, both those run by the local authority and by private leisure companies. Many schools also include swimming lessons into their Physical Education curricula, provided either in the schools' own pool, or in the nearest public pool.

In the UK, the "Top-ups scheme" calls for school children who cannot swim by the age of 11 to receive intensive daily lessons. These children who have not reached Great Britain's National Curriculum standard of swimming 25 metres by the time they leave primary school will be given a half-hour lesson every day for two weeks during term-time.^[11]

In Canada and Mexico there has been a call for swimming to be included in the public school curriculum.^[12]

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Swimsuits

Main article: swimsuit

Most standard clothing is impractical and unsafe for swimming. In historical cultures, it has been common to swim nude, but in those with taboos against nudity, specialized swimwear has been the norm. Most cultures today expect swimsuits to be worn for public swimming.

Modern men's swimsuits are usually shorts also known as jammers, either skintight or loose fitting, covering only the upper legs or not at all. Almost always, the upper body is left uncovered. In some cultures, custom and/or laws have required tops for public swimming.

Modern women's swimsuits are generally skintight, either two pieces covering only the breasts and pelvic region, or a single piece covering them both plus the torso between them. Skirts are uncommon and short when included, but have been required and sometimes as much as full length in some cultures.

Competitive swimwear seeks to improve upon bare human skin for a speed advantage. For extra speed a swimmer wears a body suit, which has rubber or plastic bumps that break up the water close to the body and provides a small amount of thrust--just barely enough to help a swimmer swim faster. For swimming in cold water, wetsuits provide thermal insulation.

Swim caps keep the body streamlined.

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See also

• Buoyancy
• Diving
• FINA
• FINA World Aquatics Championships
• Fish locomotion
• Ice swimming
• Lifeguard
• List of swimming styles
• List of swimmers
• List of water sports
• Resistance swimming
• Skinny dipping
• Swimming at the Summer Olympics
• Swimming machine
• Swimming pool
• Total Immersion
• United States Masters Swimming

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References

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Bibliography

• Bender N. & Hirt N., Did Turkish Van cats lose theyr fear of water? Forschungspraktikum Evolutionsökologie, University of Bern, Bern 2002.
• Bender R., Die evolutionsbiologische Grundlage des menschlichen Schwimmens, Tauchens und Watens: Konvergenzforschung in den Terrestrisierungshypothesen und in der Aquatic Ape Theory. Diploma thesis, Institute of Sport and Sport Sciences, University of Bern, Bern 1999.
• Cox, Lynne (2005 by Harvest Books). Swimming to Antarctica: Tales of a Long-Distance Swimmer. 2005 by Harvest Books. ISBN 0-15-603130-2. 
• Maniscalco F., Il nuoto nel mondo greco romano, Naples 1993.
• Mehl H., Antike Schwimmkunst, Munchen 1927.
• Schuster G., Smits W. & Ullal J., Thinkers of the Jungle. Tandem Verlag 2008.
• Sprawson, Charles (2000). Haunts of the Black Masseur - The Swimmer as Hero. University of Minnesota Press. ISBN 0-8166-3539-0. svin
• Tarpinian, Steve (1996). The Essential Swimmer. The Lyons Press. ISBN 1-55821-386-4. 
• Widmer F., Ein erster Vergleich des Verhaltens am Wasser zwischen Hauskatzen und Türkischen Van-Katzen. Diploma thesis, University of Zurich, Zurich 1990.

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External links

• Drowning Prevention and Water Safety Information from Seattle Children's Hospital and the Washington State Drowning Prevention Network.
• Swimming Injuries and Illnesses
• BBC guide for learning to swim: the Front Crawl, the Breaststroke, the Backstroke, the Butterfly
• Overview of 150 historical and less known swimming-strokes
• Very good specialist Swimming equipment web site
• Blog all about swimming
• [3]

International swimming v • d • e
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Asia: AASF – Asian Championships      Africa: CANA – championships by Zone      Americas: UANA – Regional championships for Caribbean (CISC), Central American & Mexico (CAMEX), Central American & the Caribbean (organized by CCCAN), and South America (organized by CONSANAT)      Europe: LEN – European Champs. | European SC Champs.      Oceania: OSA – Oceania Championships

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