Pay attention to prevent cramps before swimming. Otawa's cramp during swimming is related to my body, which is mainly caused by insufficient supply of heat, salt, calcium and phosphorus in the body, and also related to sleep. Therefore, the effective methods to prevent cramps during swimming must pay attention to the following points: increase body calories: swimmers should eat more meat and eggs, increase the intake of body fat and protein, and eat more sweets. Especially when swimming in rivers, due to the low water temperature, we should pay more attention to supplement the body heat to prevent swimming cramps. Increase the amount of salt: In hot summer, people sweat a lot, and some necessary inorganic salts (such as sodium chloride) are discharged from the body, which makes people feel weak. Swimming can easily lead to cramps in this situation. To this end, drinking a glass of salt water before swimming every time helps to prevent cramps. Increase calcium, phosphorus and potassium: Because the skin shrinks when swimming in cold water, sweat pores are closed, and metabolites can only be excreted through urine, so the urine volume increases and the number of urination increases when swimming, and not only sodium and potassium are lost, but also calcium and phosphorus are lost, which is easy to cause potassium deficiency and general spasm. Therefore, swimmers should eat more foods rich in calcium and phosphorus such as potatoes, wax gourd, soybeans, mung beans, amaranth and kelp. Ensure adequate sleep: swimming in a state of insufficient sleep, excessive fatigue and decreased physical resistance is the most likely to cause cramps, so pay attention to maintaining adequate sleep before swimming. What should swimmers pay attention to? Warm up first, then go into the water. Why do children often drown in summer? The reporter interviewed Wu Xiangyuan, director of Guangzhou Swimming Management Center. In his view, in addition to the lack of sufficient safety awareness and self-help awareness of swimmers, there is another reason that the safety measures in many swimming places are not too hard. Choose the swimming place carefully. He said that a qualified swimming pool or swimming pool must have excellent safety measures to ensure the personal safety of the majority of swimmers. A qualified swimming place must meet the following requirements: qualified special life-saving personnel, complete life-saving equipment, complete rules and regulations, and a specially established infirmary. Therefore, the majority of swimmers must carefully consider when choosing a swimming place, and it is best to go to a more formal swimming pool if conditions permit. Strengthen the awareness of self-protection. Swimmers must pay attention to strengthening their awareness of self-protection when swimming. Director Wu, a former swimming coach, gave some advice to swimmers. He said that the most important reason for frequent safety accidents in swimming places in recent days is the swimmers themselves. Many swimmers forget the concept of safety and neglect their own safety for quick success and instant benefit, which is very dangerous. You can't dive in the swimming pool. Director Wu believes that children and young students must be accompanied by parents or full-time managers when swimming in the swimming pool, and it is best to swim only in shallow waters and try not to go to deep waters. Be disciplined in the water and don't dive, because the depth of the swimming pool can't reach the standard of diving. In addition, don't fight in the water and obey the unified command of adults or managers. Don't panic when drowning, don't hold hands or kick your feet, otherwise it will only speed up the sinking. The drowning man had better relax himself and try to keep his head out of the water. Do warm-up exercises before going into the water. Director Wu also specifically mentioned that he said that the weather is hot and swimmers must do warm-up activities before entering the water, such as doing gymnastics, bending over, reaching out and so on. In short, they must fully warm up their bodies. Otherwise, it is easy to have cramps and other accidents. Finally, Director Wu also mentioned that patients with heart disease or hypertension had better take other fitness methods instead of swimming in the swimming pool. If you must swim, don't go to deep water, because deep water is the most prone to safety accidents.