As a physical education major student and several ice hockey players in a well-known key middle school in Beijing, Zhang Xiaotian has been in contact with ice hockey since he was 6 years old and has been practicing for 8 years. However, an unprecedented pain penetrated Zhang Xiaotian's knee and became more and more serious. In the next few days, Zhang Xiaotian had to stay in bed at home, and his knee ached. Teacher Zhang from middle school told the Economic Observer that his figure is not very advantageous in the ice hockey team, but he is diligent and active, and his parents support him very much. In order to get good grades, Zhang Xiao will train on the ice five times a week for one and a half hours each time. Li Hongbiao, deputy chief physician of sports injury in Yunnan Haigeng Sports Training Center, said that there is no immediate treatment for patellar tendinitis, so we can only rest, and we can't train for months or even a year, which may leave sequelae. Now, despite Zhang Xiaotian's gradual recovery, he has begun to resume basic training. However, it is still unknown whether the injury can be fully recovered and whether the child can continue to participate in high-intensity competitions in the future. Zhang Xiaotian's experience is not unique among more than a dozen ice hockey students in this middle school.

Behind the experience of Zhang Xiaotian, it is estimated that the Beijing Winter Olympics alone will reach at least 3 billion RMB. At noon, the skating rink in Kloc-0/2 was empty, only one boy was practicing ice hockey with a foreign coach. Zhao Zhuoran sat in the coffee bar facing the skating rink on the second floor, staring at his children through the glass wall. The middle-aged man has a pair of 7-year-old twins-brother Bingo and sister Apple. They have been practicing ice hockey together for two and a half years. They are all registered players, Bingo is the captain and Apple is the goalkeeper. In order to let my brother take on the duties of captain better, they deliberately chose to give one-on-one private lessons when the traffic at the skating rink was low. "Foreign coaches are different from China coaches. You see, the coach is playing a little game with him, just to increase the fun and interest of practicing. The coach did a one-legged slide just now. This is teaching children to take the initiative to protect themselves when they fall. Domestic coaches can't do this action. " Zhao Zhuoran commented like a sports commentator that this man who doesn't have to go to work on weekdays doesn't want to expose his career.

Huaxing Ice Sports Center is located outside the Fifth Ring Road in northeast Beijing, surrounded by villages, villas and international schools. In the parking lot, there are all famous cars such as Mercedes-Benz, BMW and Volvo. Zhao Zhuoran, who drives Tesla, said that there are at least 300,000 to 400,000 families who let their children practice ice hockey, belonging to the upper middle class. Of course, very rich families with assets of hundreds of millions are rare. "But if there are more people playing ice hockey in Haidian, the class will be scattered, and some relocated households will open tens of thousands of dollars to take their children to play ice hockey." He said. However, his teammates also suffered injuries similar to those of Zhang Xiaotian, and it took them nearly a year to recover. The child's mother Svetlana (Russian) told the reporter: "We neglected physical exercise for a long time, and the child didn't get enough rest, and the knee soon became inflamed. We don't want this to happen again. "

What is patellar tendinitis? What does this injury have to do with ice hockey training? Dr Li Hongbiao said that not only ice hockey, but also basketball, football and other common sports have many similar cases. "In high-intensity exercise, the knee joint, as the intersection of leg bones, muscles and ligaments, bears considerable impact. When the muscle strength of legs and buttocks is insufficient, it will aggravate the wear and tear of knees. When you are in poor health, you are more likely to get hurt. Therefore, the muscle training and physical training time of legs and hips must not be lower than skill training. " Li Hongbiao said.