Don't sit on the ground and rest immediately after strenuous exercise, and don't take a shower immediately. Swimming, like bathing, is a large area of contact with water. In order to keep the body temperature constant after fitness, blood vessels on the skin surface dilate, sweat pores expand and sweat increases, which is beneficial to heat dissipation. At this time, if cold water suddenly stimulates blood vessels to contract immediately, blood circulation resistance increases, cardiopulmonary burden increases, and body resistance decreases, people are prone to illness.

Preparation before swimming:

1, warm-up exercise

In cold muscles, muscle blood flow is poor, but after warm-up exercise, muscle blood flow increases, which can improve muscle viscosity and joint range of motion, and then the extensibility of connective tissues such as tendons and ligaments also increases, which is very important for some projects that particularly need joint exercise. After warm-up exercise, the "softness" of the body can be improved because of the increase of body temperature.

Step 2 stretch

In the warm-up match. Static stretching exercise is very important for injury prevention and recovery. Static stretching should be carried out after exercise, and static stretching before exercise may limit the exertion of muscles and have limited effect on preventing injury. When doing static stretching, do it equally on both sides.

Extended data

Precautions for sports meeting:

1, should not rest immediately.

During strenuous exercise, people's heart beats faster, muscles and capillaries dilate, and blood flows faster. At the same time, the rhythmic contraction of muscles will squeeze the venules, prompting blood to flow back to the heart quickly.

At this time, if you stop to rest immediately, the rhythmic contraction of muscles will also stop. A large amount of blood that originally flowed into the muscle can't flow back to the heart through muscle contraction, resulting in a drop in blood pressure and temporary ischemia of the brain, which may lead to palpitation, shortness of breath, dizziness, pallor and even shock and fainting.

2, should not be excessive drinking.

When thirsty after strenuous exercise, some people binge drink boiled water or other drinks, which will increase the burden of gastrointestinal tract and dilute gastric juice, which not only reduces the bactericidal effect of gastric juice, but also hinders the digestion of food.

Drinking water too fast will also increase the blood volume too fast, which will suddenly increase the burden on the heart, cause temporary disorder of electrolytes such as potassium and sodium in the body, and even cause heart failure, heart tightness and abdominal distension. So don't drink too much water after exercise, let alone cold drinks, otherwise it will affect your body temperature and cause colds, abdominal pain or other diseases.

3, it is not appropriate to eat a lot of sugar.

Some people feel comfortable eating sweets or sugar water after strenuous exercise, and think that eating sweets after exercise is good. In fact, eating too much sweets after exercise will consume a lot of vitamin B 1 in the body, and people will feel tired and lose appetite, which will affect the recovery of physical strength.

4. It is not advisable to drink alcohol immediately.

After strenuous exercise, people's physical function will be at a higher level. Drinking alcohol at this time will make the body absorb alcohol faster and enter the blood, which will do more harm to organs such as liver and stomach than usual.

This will cause fatty liver, cirrhosis, gastritis, gastric ulcer, dementia and other diseases for a long time. Drinking beer after exercise is not good, which will make uric acid in blood increase sharply, which will greatly stimulate joints, cause inflammation and gout.

Baidu encyclopedia-stretching

Baidu Encyclopedia-Sports Tips

Baidu encyclopedia-warm-up exercise

Baidu encyclopedia-sports