| The importance of women’s 200 m freestyle swimmers on the swimming circuit is reflected in several ways.In addition to the gold MEDALS of individual events,there are also the gold MEDALS of 4×200 meters freestyle relay in the Olympic Games.In addition,the athletes of 200 meters freestyle may also hold both the tasks of 100 meters and 400 meters freestyle.Moreover,the women’s 200 meters freestyle has always been the dominant event of China and has the strength to win the Olympic gold medal.In this thesis,using the method of literature,video analysis,mathematical statistics,case analysis and expert interview,through the fixed-point camera recording women’s 200 m freestyle final video,Using the software of Swimming Race,this thesis analyzes the technical and tactical characteristics of the top eight athletes in women’s 200 m freestyle final of the four National Swimming Championships from 2016 to 2019,extract the athletes’ start,way to swim,turn,sprint four competition link data.In addition,SPSS 26.0 version was used to conduct statistical processing on the data,such as one-way analysis of variance and correlation analysis,and at the same time,a comparative study was conducted with foreign excellent female 200 m freestyle athletes.The results showed that:(1)The results of the top eight athletes in the women’s 200 m freestyle final of the 2016-2019 National Swimming Championships showed a downward trend,but there was no significant difference(P>0.05).The performence of the way to swim on the way decreases year by year,with significant difference(P<0.05).There is a significant difference in turn time(P<0.05),indicating that the turn performance of Chinese athletes decreased,with the best performance in 2016 and the worst performance in 2017.There was no significant difference between the starting reaction time and the starting 15 meters time(P>0.05).The results of 5 meter sprint showed an upward trend,and there was no significant difference(P>0.05).(2)There are significant differences between the first eight athletes of women’s 200 m freestyle final in 2016-2019 National Swimming Championships and 2017 and 2019 World Swimming Championships in terms of performance,start,turn,way to swim and sprint,indicating that there is still a certain gap between the overall level of Chinese women’s 200 m freestyle athletes and that of the world.There was a significant difference in the turn and start performance(P<0.01),which was significantly lower than the world-class athletes.Secondly,the difference was in the way to swim,and some of them had extremely significant difference(P<0.01).The performance of 5 meter sprint was similar to that of world class athletes,and there was no significant difference(P> 0.05).(3)Through the development of Champion Models of 2016-2019 National Swimming Championships and 2017 and 2019 World Swimming Championships,it can be seen that there is a gap between Chinese champion athletes and world-class champion athletes in all aspects of the competition,and the gap is ranked as follows: In the turn part >way to swim> sprint > starts,and the gap in the turn part is the most obvious,which is consistent with the statistical results above.(4)Technology: the starting technology of athletes at home and abroad is track start.After starting,the number of underwater dolphin kick and the distance out of water of Chinese athletes show a trend of increasing year by year.The main techniques of Mid-cross arm movement technique(56.25%),unilateral breathing mode(85.40%)and 6:2:1 leg arm and breathing coordination(81.25%)were used by the athletes at home and abroad.Chinese athletes have the technical characteristics of long distance per stroke and slow stroke frequency,while world-class athletes show the trend of fast stroke frequency and short distance per stroke.The technique of sprinting is to hold your breath appropriately to improve your speed.The last contact with the pool wall is to extend your arms and body forward as far as possible by turning your head and lateral turn body to achieve the fastest contact with the pool wall.(5)Tactics: the overall speed distribution pattern of women’s 200 m freestyle swimmers at home and abroad is roughly the same.Athletes generally swim faster in the lap1(0-50m),while the performance of the lap2(50-100m)drops significantly until the lap4(150-200m)begins to improve the swimming speed.The performance of world-class athletes shows the tactical characteristic of uniform speed while the performance of Chinese athletes fluctuates greatly.The speed reserve index shows that elite athletes can better control their swimming speed,and stand out from the preliminary and semi-finals with the minimum consumption,until they play the highest competitive level in the final. |
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