Study On The Development Characteristics Of Movements Of Start Of A Race Of 7-12 Years Old Children

Start is an important part of the complete technique of sprinting,which plays an important role in the improvement of sprint performance.The research on the development of children’s dash running action can understand the physical quality of children and the development of their nervous system.Through the analysis and summary of children’s starting action to develop physical characteristics of the law,can help students master the appropriate action skills and skills,but also to help sports teachers to better develop in line with the development of children’s sports teaching program and curriculum content,In this paper,the paper analyzes the running of 213 primary school students of Zhaozhuang Primary School in Gaocheng City by using the methods of literature,test,expert interview,observation,video analysis and mathematical statistics.The paper analyzes the characteristics of the vertical starting action of 7-12 year old children’s sprint station,and focuses on the action characteristics of the limbs in the 15-meter acceleration phase,the overall action characteristics and the distribution of the number of people in different ages..The results are as follows:Children aged 1-7 to 12 years old:(1)When "in each position",the head forward bending is negatively correlated with age,and the older the head forward bending is,the fewer the number will be;The number of people with upright heads increased with age.(2)When "preparing",the number of people with naturally drooping arms gradually decreases with age,and is almost zero at the age of 12.(3)Instant leg off the ground,with the increase of age,the swinging leg can actively fold;The number of people who landed on the balls of their feet while supporting their legs was on the rise.The movement characteristics of children aged 7-12 in standing start within 15 meters are as follows:(1)With the growth of age,the students who kept their heads upright showed an overall increasing trend.(2)The swing of the arms gradually transits from the original left-right,asymmetric orunswinging arms to the front and back active and rapid swinging arms.(3)With the increase of age,the body movement showed a slightly forward tendency.(4)Swing legs can be folded actively,and pedal legs can be extended actively.After the age of 9,the proportion of children’s active folding and stretching of swinging legs increased.The starting speed of children is influenced by the position relationship between the upper limb and the swinging leg,the position relationship between the upper limb and the supporting leg,and the position relationship between the upper limb and the swinging leg in the post-pedal stage.The amplitude of rapid swinging arm can fully increase the amplitude of the supporting leg kicking off the ground and the swinging speed after rapid kicking off the ground.