Analysis Of Three-dimensional Technique Of Butterfly Stroke Mid-stroke By My Country's Outstanding Swimmer W.c

Butterfly event in our country has been in a state of yin and yang,women butterfly athletes in the world’s major competitions for gold and silver,men butterfly athletes have been unable to reach the final.In recent years,the men’s butterfly events in our country have been on the rise,but there is still a certain gap between our men’s butterfly events and the world’s elite men’s butterfly swimmers.At present,the study of butterfly technique in our country mainly uses the two-dimensional technique to the video and the result of the competition,and some studies the influence of the training on each part of the butterfly stroke.In this paper,the underwater 3-d technique was used to analyze the butterfly stroke technique of W.ch,an elite Chinese swimmer,and the related kinematic parameters were obtained.The results were as follows:The position of the hip joint of the W.CH was relatively stable during swimming;It is good for keeping the body in a higher position and for maintaining the swimming speed.The lower head position,while conducive to the body in the swim into the wave-shaped,but also increased the head out of the water time.When the W.CH enters the water,the angle of the elbow joint is small,which is not conducive to the extension of the Arm The elbow joint is too relaxed in the water-out stage,but the palm is inclined to the upper side of the body when the water-out stage,which is conducive to rapid water-out.The advantages of W.ch trunk and leg techniques are strength in the legs,good control of the hips and knees,and flexibility in the ankles.The disadvantage is that the angle of the ankle is delayed relative to the knee.The w.ch has a deliberate movement of raising the head when breathing in conjunction with the arm technique.Inhale too early,not using the late inhale technique,and lower the head too late.The head does not start to lower until the arms pass over the shoulder from both sides.