Some scientists have done such statistics: running in water for 20 minutes consumes the same heat as running on land 1 hour, and the physical strength is much faster than that on shore.
Why is it not fast in the water?
This is because water is amorphous, flowing and sticky, and athletes can only find a way to swim faster by "water resistance".
There are three kinds of resistance in swimming:
Shape resistance: when swimming forward, the fatter a person is, the greater the resistance is; Water wave resistance: The smaller the water ripple produced during swimming, the smaller the resistance will be, and the fish will swim fast in the water, which is also because the fish only produce small ripples when moving; Surface resistance: the resistance caused by the friction between water and skin, the armpit hair problem we discussed, is also one of the surface resistance. At the 2008 Olympic Games, Phillips took part in eight swimming events and won eight gold medals, which surprised everyone. Is Phillips really that good? In addition to Phillips' strong personal ability, his shark skin swimsuit also helped him a lot.
Shark skin swimsuit is a kind of high-tech swimsuit that imitates shark skin. It uses special fabrics, which can greatly reduce the viscous resistance (surface resistance) caused by water during swimming, and then make swimmers swim faster.
It can be seen from this incident that the resistance of water will really affect the performance of the game. Later, for the sake of fair and just competition, FINA banned shark skins and other similar high-tech swimsuits.
Why do swimmers shave their armpits? Swimming can not only show the perfect combination of strength and beauty, but also let us appreciate the "devil figure" of many handsome guys and beautiful women. In addition, there is another detail. All the athletes in the competition have no armpit hair, especially the European and American athletes with strong body hair. As soon as they arrived at the competition site, their hair disappeared and their whole bodies became extremely clean and refreshing.
Why is this? Let's get to know each other!
First, armpit hair will increase the forward resistance when swimming.
The fish in the water swim very fast. In addition to having a smooth figure, the scales covering the body are also very smooth, which can minimize the resistance of water. If you want to swim fast, the less resistance, the better. Scientists have long discovered that when people swim, the hair of their bodies will produce resistance because of mutual friction in the water. Later, it was found that shaving a person's beard can improve the swimming speed by 0. 1 second, while shaving all the body hair exposed to clothes can improve the swimming speed by up to 2%.
In some large-scale international competitions, all the top athletes can enter the finals. No matter in swimming skill or swimming talent, there is only a millimeter gap, and it is uncertain who will win the championship until the last moment.
If you can improve your grades a little, even if it is 0. 1 sec, it may affect the attribution of the champion and runner-up. Therefore, since hair is resistance, how to reduce unnecessary wear has become a research topic in every country.
Second, shaving armpit hair in order to protect athletes from injury in the competition
One minute on the stage, ten years off the stage, all those who can compete are going for the championship, and the intensity can be imagined. During the competition, armpit hair will constantly rub the arm, which is easy to cause skin abrasions and redness. The cousin of the provincial team also told me that he is not so particular about training at ordinary times and will not deliberately deal with body hair. Only when you take part in a big competition will you be asked to remove your body hair.
Third, it can be more beautiful and hygienic in front of the camera.
① Swimming athletes wear less, and male athletes show more, especially like European and American athletes with heavy body hair. If every athlete doesn't deal with his body hair, the style of painting looks really ugly.
Swimming is also a fierce water sport, and it is inevitable that armpit hair will fall off into the water, which is very unsanitary. If there are several games a day and nearly 100 people take part, the bottom of the swimming pool will become a world of armpit hair.
Both male and female players are the focus of the competition. Moreover, events like the Olympic Games are broadcast live all over the world, and the image is still very important. Female athletes love beauty more, especially when they are out of the water, just like hibiscus.
Some people may think, since all the body hair that can be shaved has been shaved, why not shave it too?
I think there are four reasons:
Hair is our external image. Body hair is usually hidden in clothes and has different properties.
② Two-layer headgear can wrap the head perfectly, and the swimming effect is also very good, and it can also provide a fixed position for waterproof glasses.
(3) most of the time when swimming, the head is exposed on the water, which is convenient for adjusting the swimming route and breathing back and forth.
In the history of swimming, few athletes shaved their heads to participate in the competition.
To sum up, there is only one most important reason for swimmers to remove armpit hair: reducing resistance in water and improving swimming performance, which of course plays a decisive role, but it also depends on the athletes' personal strength.
Not only swimmers have requirements for hair, but also athletes on the cycling field will remove leg hair. Aerodynamic experts have proved through wind tunnel experiments that riding speed can be improved without leg hair. Written in the last 202 1 Tokyo Olympic Games is in full swing, and the competition on the field is extremely fierce. A small gap will miss the championship, and it may pass the medal in a few seconds.
For Olympic athletes, behind every medal is unremitting efforts. On the first day of the Olympic Games, China athlete Yang Qian lived up to expectations and won the first gold medal of the Tokyo Olympic Games for the China delegation. Then the next city won the gold medal in the team competition, and Yang Qian became the double gold winner of this Olympic Games.
Although the "Wenxin" group missed the championship, the silver medal is also worth congratulating. There is no ever-victorious general in the competition, just work hard and don't judge heroes by gold medals. Everyone who contributes to the country deserves respect.
Finally, I wish our Olympic athletes, in the next period of time, can make persistent efforts, be neither arrogant nor impetuous, realize their dreams in Tokyo and win glory for our country! You are the pride of the motherland.