I think Xinhua News Agency sent a very interesting message yesterday: On April 26th, Italian David Morini held his breath in a transparent water tank in Bahrain for 2 1 min for 29 seconds, more than 3 minutes longer than the Guinness record for holding his breath underwater held by his compatriot Ginoni. On the same day, before the start of the F 1 Bahrain main race held at Sakil circuit in Bahrain, the organizer arranged this underwater breath-holding challenge performance. When the past 2 1 min 28 seconds passed, Mullini, who had been holding the front wall of the water tank, suddenly tilted his head and seemed frightened. The security guard outside the water tank immediately pulled his head out of the water. Mullini slowly woke up. Although he looked very weak, he insisted on climbing out of the water tank and standing next to the "2 1: 29" electronic timing board to take a group photo. Unfortunately, this record has not been officially recognized by Guinness, because Mullini was in a coma when he held his breath, so there is no way to define how long he held his breath. Express also held a "breath-holding contest" in the summer of 2005, and the best score was 4 minutes and 28 seconds, which was quite different from that of Mulini. Why is the gap between people so big? Holding your breath for more than 20 minutes is a supernatural phenomenon. Just ask Wang Xuefen, an associate professor of respiratory medicine in the First Hospital of Zhejiang Medical University. Dr. Wang said with certainty: "This thing is true. I've seen it live on TV. There is a foreign man and cat in the swimming pool, and nothing is needed. I have been insisting for more than 20 minutes. " "You asked me to explain, it is really difficult, in the final analysis is a supernatural phenomenon. That TV program said that it is difficult for this person to reach this level after long-term training, so the average person' please don't imitate, or his life will be in danger'. " "Ordinary people hold their breath for two or three minutes. For example, the best result of the express breath-holding contest-4 minutes and 28 seconds-is already a good result for ordinary people. If the brain is deprived of oxygen for 5-8 minutes, it will cause permanent damage, and the most serious will be brain death and become a vegetative person. " Breath-holding time is determined by vital capacity. "The human body's breath-holding time is related to vital capacity. The greater the vital capacity, the longer the breath holding time. If you want to increase your ability to hold your breath, it makes sense to increase your vital capacity through exercise. " Wang Dong said. Vital capacity is the maximum expiratory volume, and vital capacity = maximum expiratory volume+residual volume, so everyone's original vital capacity is determined by everyone's chest size, which is basically good; However, the tension of pectoral muscles, the contraction of diaphragm and the ability of alveoli to exchange gas with the outside world determine the room for improvement. Dr. Wang said: "Improving the ability of alveoli to absorb oxygen can fundamentally change the time of holding your breath." The average diameter of alveoli is 0.2 mm, and there are about 300-400 million alveoli in adults, with a total area of nearly 100 square meter, which is several times larger than the surface area of human skin. It is the main part of lung gas exchange. Oxygen diffuses from alveoli to blood. After entering the blood, venous blood becomes arterial blood rich in oxygen, and blood sends oxygen to all parts of the body through blood circulation. Theoretically, to improve the ability of alveoli to absorb oxygen, it is necessary to do aerobic exercise frequently to adapt alveoli to high oxygen saturation. Then according to inertia, they can improve work efficiency and keep the human body in a high oxygen state. "Hold your breath for such a long time there must be a secret. The creator of the world record of holding one's breath took improving vital capacity as the secret. The German Stass, who once set the world record of holding his breath underwater 17 minute 19 second, had a rigorous training-strength, endurance and psychological training. After diving underwater, he can even lower his heart rate by relaxing all over, thus reducing his body's oxygen demand. Stass's lungs are about 0/5% larger than those of ordinary people/kloc-,but he refused to disclose the details of the exercise. In July last year, the medical magazine "Health Hospital" said that the vital capacity of men was 3,500-4,000 ml and that of women was 2,500-3,500 ml. People who regularly participate in sports can reach more than 5000ml. " But there is also a degree of exercising vital capacity, just like the person who created the best result of holding his breath mentioned earlier, and finally fainted. This is a dangerous signal that the human body has been highly deprived of oxygen. After the carbon dioxide in the human body reaches a certain level, the brain sends out the instruction of' must breathe'. If you want to hold your breath again, you will breathe. If you are still in the water, the water will be sucked into your lungs and there is a danger of suffocation. "Wang Dong said.