| This article through the literature material method,mathematical statistics method,image analysis method,video shooting method and comparative analysis as research methods,and in the 12 th national games in 2013 and 2017 the 13 th national games men’s 400 m individual medley of athletes technical and tactical characteristics as the research object,the two national games competition video parsing,analysis of the athletes technical and tactical indicators as to provide theoretical basis for the coaches and related scientific research personnel,in order to the technical,tactical diagnosis and optimization of athletes.The research analysis draws the following concluions:1.Compared with the 12 th national games in 2013,the average performance of the athletes in the men’s 400 m individual medley final at the 13 th national games in 2017 decreased,mainly in the 275 m swimming stage.Especially in the breaststroke section,the athletes’ average speed index decreased significantly,resulting in the decline of the final score.2.The athletes in the men’s 400 m individual medley final of the 13 th national games in 2017 have improved their starting and sprinting skills from the start to the side of the 5-meter sprint compared to the national games in 2013.Their starting skills have been improved 00:00.16 and their sprinting skills have been improved 00:00.16.Starting and sprinting to the edge of 5 meters is the beginning and end of the whole race.The improvement of these two technologies indicates that in the normal training process,coaches,athletes and relevant researchers have improved their training level for technical details.Indirectly,it shows that the athletes pay more attention to the competition.They are more excited at the beginning of the competition and in a good state of mind.They also keep a positive and accelerated state in the final stage of the competition through tenacious fighting.3.400 individual medley athletes at the beginning of the competition--butterfly section,through the stroke frequency,stroke amplitude effective combination of speed index is the highest,at the beginning of the competition athletes in good physical and mental state,fast stroke;At the end of the competition,under the influence of the winning factors,the athletes accelerate actively and get a higher rowing frequency and a higher speed index.4.Through the two Olympic Games and national games men’s 400 m individual medley final result comparison analysis shows that China’s elite athletes in the last 50 meters of the game section scores higher than the Olympic final athletes,on competition tactics are more inclined to keep enough energy,assigned to the 50 m freestyle positive acceleration.5.The speed reserve index of the athletes in the finals of the two national games is positively correlated with the final ranking of the games,that is,the competition strategy of "power grab" is adopted.Athletes with higher speed reserve index are more likely to achieve good results in the finals.Because the higher the speed reserve index of elite athletes is,the better the athletes’ control of individual events will be.In the morning preliminary competition,athletes reserve their physical fitness on the premise of ensuring that they can enter the final.In the final stage of the evening,the athletes sprint,skills,tactics with each other,the impact of the medal.6.Through the principal component analysis method to analyze the performance of the athletes in the finals of the two national games,the contribution rate is the highest in paragraph 2,paragraph 3 and paragraph 4,that is,after the adjustment stage of paragraph 1 and the "1 plus" of the tour to lay the foundation for the final performance of the competition;In addition,through the reasonable physical fitness allocation in the first paragraph,the speed of each section in the whole process was optimized to achieve the reasonable distribution of physical fitness.Through the sprint in the eighth paragraph,the execution and application of the tactics were completed. |
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