The Investigation On The Difference Of Direction Changing Ability And Related Physical Factors Of Badminton Players At Different Levels

Research purposes: Badminton has complex action characteristics,and opportunities and challenges coexist in the development of competitive sports in our country.The ability of a badminton player to change direction is one of the important abilities for them to successfully complete their steps on the court and to hit back effectively.The research on the physical factors related to the ability to change direction is an important basis for the selection and training of badminton players.The purpose of this study is to explore the differences between the direction change ability and related indicators of badminton players at different levels,and to find out the main physical factors related to the direction change ability of badminton players at different levels,enrich the research system and provide training guidance.Research methods: The study selected 82 athletes from Zhejiang Badminton Base training center for testing,and divided male and female athletes into three groups:elite group,first-level group and second-level group,and participated in the measurement of height,weight,leg length,and body fat;Y-Balance dynamic balance test(anterior,posterior medial,posterior lateral);sitting body forward flexion test;30-meter straight sprint test;Counter Movement Jump vertical jump test;Drop Jump test;And "meter" changing direction running test 1.One-way ANOVA analysis of variance was performed on the indicators of each group of male and female subjects,and p<0.05 was considered to be significant at the level of difference;2.The correlation between the indicators and the ability to change direction for the male and female subjects and after grouping using Pearson’s analysis,p<0.05 is defined as the significance;3.The main related factors of the direction-changing ability of male and female badminton players of all levels are extracted by Multiple Regression.Research results: 1.According to the results of One-way ANOVA analysis of variance,(1)male subjects with different levels have significant differences in the indicators of changing direction running time,height,weight,leg length,YBT on both sides,and 30-meter straight sprint.Time-consuming to change direction(s): the significant difference between the athlete group and the first-level group and the second-level group(p=0.042,p=0.002);height(cm): the athlete group and the secondlevel group(p=0.001);Body weight(kg): first-level group and second-level group(p=0.027);both leg lengths(cm): first-level group and second-level group(left p=0.039,right p=0.026);both sides YBT(%): the second group and the elite group(p=0.022 on the left,p=0.035 on the right),the second group and the first group(p=0.001 on the left,p=0.020 on the right);30-meter straight line Sprint(s): The differences between the second-level group,the elite group,and the first-level group were(p=0.000,p=0.002).(2)Female subjects of different levels changed direction running time,body weight,and YBT on both sides.There are significant differences in the five indicators of sitting forward flexion and 30-meter straight sprint.Timeconsuming to change direction(s): the elite group and the second-level group(p=0.001);weight(kg): the elite group and the first-level group group(p=0.026);YBT on both sides(kg): the strong group and the secondary group(p=0.018 on the left,p=0.044 on the right);sitting forward flexion(cm): the strong group and the secondary group(p=0.044 on the right);=0.016);30-meter straight sprint(s): the pvalues of the second-level group,the elite group and the first-level group were all0.000.2.According to the Pearson correlation test results,(1)male subjects: the elite group DJ-There is a significant negative correlation(p=0.000)between RSI(m/s)and time-consuming(s)for changing direction(p=0.000),that is,the greater the reaction strength index,the shorter the time-consuming for changing direction and the stronger the ability to change direction;30-meter straight sprint(s)was significantly positively correlated with the time-consuming(s)for changing direction(p=0.005),that is,the faster the speed,the shorter the time-consuming for changing direction,and the stronger the ability to change direction.The first-level group CMJ-Height(cm)(p =0.013),DJ-RSI(m/s)(p=0.009)were significantly negatively correlated with the direction change time(s),that is,the larger the values of the above two indicators,the shorter the direction change time and the better the direction change ability.Strong.The 30-meter straight sprint(s)(p=0.048)in the second group was significantly positively correlated with the time-consuming(s)for changing direction,CMJ-Height(cm)(p=0.002),DJ-RSI(m/s)(p=0.009)was significantly negatively correlated with the time-consuming(s)for changing direction.(2)Female subjects: The second group30-meter straight sprint speed(s)was significantly positively correlated with the timeconsuming(s)for changing direction(p=0.002),that is,the faster the speed,the shorter the time required to change direction,and the stronger the ability to change direction.3.According to the results of multiple regression analysis,(1)the male athlete group(β=-2.874,r2=0.818)and In the first-level group(β=-2.573,r2=0.421),the main factors related to the ability to change direction were DJ-RSI(m/s),and the main factor related to the ability to change direction in the second group was CMJHeight(cm)(β =-0.125,r2=0.526);(2)Women only have two level group and the main related factor was the 30-meter straight sprint(s)(β=4.472,r2=0.615).Research conclusions: 1.The higher the level of badminton players,the more obvious the advantage of body shape,which is more in line with the priority of sports material selection;the higher the level of athletes,the better the ability to change direction and speed.2.The related factors of the male athlete’s ability to change direction are linear movement speed and lower limb reaction strength;the relevant factors of first-level athletes’ direction-changing ability are lower-extremity explosive power and lower-extremity reaction strength;the relevant factors of second-level athletes’ ability to change direction are movement Speed,lower extremity explosive power,and lower extremity response strength;the ability to change direction in female second-level athletes was related to the speed of movement.3.The main factor related to the ability of male badminton players to change direction is the lower limb reaction strength,may be enhanced impact after the lower limb touches the ground is similar to the pattern when the badminton requires turning on the ground;It is related to the performance of direction change ability in lower level female athletes.