Comparative Study On The Techniques Of Chinese And Foreign Elite Women's 20 Km Race Walkers

Race walking is the track and field event where China has won the most gold medals in the Olympic Games and World Series.In order to improve and optimize the technical level of China 's women 's 20-kilometer walkers,this paper uses the literature data method,measurement method,expert interview method,comparative analysis method and mathematical statistics method.Researched the walking skills of eight women 20 km walkers(4 foreigners,4 Chinese)in the 2018 IAAF World Walking Championships.1.The speed of eight Chinese and foreign athletes in this game is "slow in the first half and fast in the second half".The speed fluctuations in the first half were relatively gentle,and the speed fluctuations in the latter half were relatively large,and the acceleration continued from 12 km to 18 km.2.The average pace of the four Chinese athletes from low-speed walking,medium-speed walking to high-speed walking is faster than that of the four foreign athletes,and the increase of the pace is faster than that of the foreign athletes,but the average pace of the four Chinese athletes The length is shorter than the average step length of four foreign athletes.With the acceleration of walking speed,the average step length of foreign athletes continues to increase,while the average step length of Chinese athletes is always the same.Foreign athletes mainly increase the step length at medium and high speeds.To complete the second half of the game,our athletes complete the game by maintaining a steady step length and increasing the pace.3.Compared with foreign athletes,Chinese athletes have a lower torso forward angle.From low speed to medium and high speed,Chinese athletes' front and back swings are not sufficient at the moment of leaving the ground,and the shoulder joints are not relaxed,especially the swing of the arm's back swing relative to foreign athletes.Low-speed to medium-speed and high-speed Chinese athletes' rear pedals have become full and inadequate,and the hind leg pedal extension force is small.The pedaling angle of foreign athletes walking at low to medium speeds increases.The pedaling angle of foreign athletes at high speeds is similar to that of Chinese athletes,and the pedal extension is not sufficient.The angle of the knee joint of Chinese athletes is larger than that of foreign athletes,which is larger than the reasonable value of the knee joint angle of the ground.Low-speed,high-speed athletes in my country have a smaller angle between their thighs than foreign athletes,and the after support time is also shorter.4.Chinese athletes control the torso posture better than foreign athletes,but the back swing of the arm is small and insufficient at the time of landing,and the uneven angle between the front and back arms is obvious.The landing angle of Chinese athletes is smaller than that of foreign athletes,and the weak ankle joint strength leads to the failure of toe hook at landing time.The knee joint angles of the eight Chinese and foreign athletes are greater than the reasonable value,but the knee joint angles of foreign athletes are greater than those of Chinese athletes at the moment of landing,especially at medium and high speeds.Insufficient hip swings limit the front swing of Chinese athletes' swing legs The front swing is not large enough,and the stride length is affected.The Chinese athlete Wang Na's calf tension at medium speed and Yang Jiayu's calf tension at high speed,and the back lift is obvious.The angle of the knee joint of the two thighs is smaller than that of foreign athletes.The time for front support is shorter than that for foreign athletes.5.Chinese athletes have shorter flight times than foreign athletes at low speeds.The flight time for medium-speed and high-speed walking gradually increases and exceeds the flight time of foreign athletes,but less than the flight distance of foreign athletes.Wang Na's flight time at medium speed and the up and down distance of his head increased.Chinese athletes who walked at medium to high speeds have larger ups and downs distances than foreign athletes.Qieyang Shijie and Yang Jiayu have increased vacancy time at high speeds and increased ups and downs distances.