On the morning of October 25, in the Hefei International Marathon, a 30-year-old boy who ran half a horse suddenly fell before the end of the race and died after being rescued. Another marathon death is heartbreaking. In the past two years, the country has presented a blowout marathon boom, and the safety problem of running "horse" deserves the attention of all runners. Some witnesses said: "At about 21 kilometers, he suddenly fell to the ground. At that time, he was unconscious. The medical staff immediately rescued him while doing cardiopulmonary resuscitation while doing artificial respiration." After the scene was rescued Mr. Li was rushed to the hospital by 120 ambulances. At two o'clock in the afternoon, Mr. Li died after being rescued. [1, marathon sudden death and physical independence] Finishing a marathon was once considered a symbol of health. However, in this tragedy, we can't help but ask: Why is the deceased's body so good (often exercised), and will still die in the prime of life? With this question, I have consulted a lot of information, and the result has come to a conclusion: the sudden death of the marathon has nothing to do with the quality of the individual. In 2007, in the US Olympic Marathon qualifier, a professional athlete named Shea died at 16 minutes and 53 seconds after departure. At the age of 28, Xie Yi won the US Road Marathon four times before his death. In this regard, the medical community uses the "reverse effect" to describe the case of sudden death in the marathon, which is usually beneficial to people. If it is excessive, it will have the opposite effect. A study published at the 2010 Canadian Cardiovascular Summit in Montreal showed that although regular exercise can reduce the risk of cardiovascular disease by 30% to 50%, if it is a marathon, the risk of cardiovascular disease is increased by a factor of seven. [2. Is the death rate of the marathon high? 】 According to a survey by the world-renowned running magazine Runner World, one in every 50,000 to 88,000 marathon participants worldwide (including those who died within 24 hours after the game). This is already higher than the case of a sudden death per 100,000 to 300,000 people in the general movement. Is the marathon really a "high-risk sport"?    American cardiologist Dr. Paul Thompson pointed out: "Sports is not a savior. But the risk is very low, the benefits are real, so overall the benefits outweigh the disadvantages." The death is unfortunate and worthy of reflection, but compared to the sport itself. Positive, it is a risk with little probability to control. There are more dangers in our lives than accidents during the game.  There were tens of thousands of people participating in the marathon, and the media was highly focused. In fact, any physical activity that is carefully examined under a magnifying glass will be seen as a lot of problems. Every news about the marathon's sudden death is sensational. From this point of view, its accident exposure is very similar to the air crash. [Three, half horse is not equal to the difficulty of halving] Many people think that a half marathon should be lower than the full marathon risk factor. Professionals and famous runners said that this is a very dangerous misunderstanding. This inevitably reminds me of a news I saw a year ago: "The tennis star Serena Williams participated in the marathon. As a result, he ran for one kilometer and was backed by the bodyguard because of physical exhaustion." This is recognized as a top athlete, and she even Half a horse can't finish, do you still think that there is no difficulty in half horse? Just like the martial arts novels, Shaolin's seventy-two stunts need the corresponding Buddhist scriptures to reconcile murderousness. Every sport also needs professional knowledge to assist. Competitive sports such as marathons require long-term systematic training and accumulation. Otherwise, even active athletes like Serena can't do it overnight. [Four, marathon to prevent sudden death success] The Tokyo Marathon is the most eye-catching in the global IAAF official statistics competition. It has been dead since its inception in 2007. Professor Yukio Tanaka of the Tokyo Marathon Medical Ambulance Command revealed that the secret is the timely use of CPR (cardiopulmonary resuscitation) and AED (automated external defibrillator). For this purpose, the organizing committee is equipped with 66 AED equipment, 15 ambulance stations, 42 doctors, 70 nurses and 420 professional ambulance members. Medical volunteers ensure that first aid can be implemented within 2 minutes. A part of the external defibrillator is also placed on the running bicycle team to ensure that the patient's ventricular fibrillation is eliminated in prime time. There are also dozens of emergency doctors. They follow a variety of speeds in a large crowd of people to run, in order to be able to help at any time with an accident. In fact, in public places such as airports and subway stations, this notebook-sized box can often be seen everywhere, so that the first-time automatic defibrillation can be performed for people with sudden heart disease. It can be said that the security of the Tokyo Marathon benefits from the developed public health system in Japan. [Five, these people are not suitable for marathon] 1. A person with a heart disease. From heart disease, people with rheumatic heart disease and congenital heart disease are not suitable for long-distance running. In addition, people who have had heart disease in the near future, people with severe coronary artery disease (angina), or chest pain when doing minor activities, and those who are white and blue during exercise are not suitable for long-distance running. Worst of all, some heart diseases usually have no symptoms, even the patients themselves do not know that their heart has hidden diseases, such people running long distance is the most dangerous. 2. A cold patient. Like a virus, it can induce heart failure and myocarditis. In particular, fulminant viral myocarditis may have a sudden death. Therefore, if the cold is not good for two weeks, accompanied by cough, chest tightness, palpitation, and suffocation, it is necessary to pay attention to it, and timely treatment to avoid heart disease. 3. People with high blood pressure, diabetes or arrhythmia. After running, adrenaline rises, blood pressure and heart rate rise, which easily leads to blood pressure soaring and arrhythmia, which induces danger. 4. People who are too obese. Obese people often have metabolic disorders, and when the long-distance running is too expensive, it is easy to cause danger. 5. People who do not have a sports foundation. Long-running when there is a lack of training or poor physical condition, it is easy to get dizzy and the body can't afford such a large amount of exercise. It is recommended that people who participate in marathons or long-distance running must have a basis for long-term exercise. It is best to have a full physical examination before the competition, and those who are qualified will participate in the competition. 6. Young children and older people. Exercises that are overburdened, consumed too much, and last too long are not good for the growth and development of young children, and they also destroy their growth and development. 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