Effect Of Attack Circuit And Gender On Topspin Forehand Sports Biomechanics For Table Tennis Collegiate Students

Objective: Table tennis is the ball faster,line where rotation change much and the skills of strong in the Network isolation against the group.Forehand is considered to be one of the most deadly attack,and topspin is the most important ball spinning technique in table tennis.Gender athletes differences in body shape,physical fitness,and so on.Resulting in the formation of playing different from the action.Taken in the training and competition helps to form the different points of different attack line change,making opponents not to predict impact point,were slow to adjust the steps to complete the ball.On the one hand,it is not easy to score,on the other hand,it is easy to cause injury,of which waist and knee injuries are the most common.Therefore,the purpose of this study is to explore the impact of the attack line and gender on the biomechanics characteristics of the ball movement of the college students selected for table tennis in the completion of the forehand swing action.The results of the study can provide experimental support for the teaching and training practice of table tennis beginners,selected college students and coaches,and at the same time provide the basis for preventive training,and provide the basis for the prevention of sports injury caused by irregular technical movements in the competition.Methods: Twenty table tennis college students were selected as subject(included 10 males and 10 females,3D motion capture system Nokov and Betec force platform were used to simultaneously collect the kinematic and kinetic data of the three different lines topspin forehand of the subjects.Cortex 64 2.6.2.1169 software was used to identify and process the kinematic data.The influences of different lines and genders on the kinematics and kinetics data were analyzed by 2×3 two-way ANOVA.All statistical analysis was performed with SPSS 22.0 software,in which the significance criterion is set to a class of error probability and it cannot be more than 0.05.Results:(1)The analysis of the results showed that different lines and genders interacted at the angle of the upper and lower limbs(p<0.001).There was a significant difference between the angle of the upper and lower limb joints under the three batting lines.Athletes of different genders showed larger shoulder and elbow flexion angle(p<0.001)and smaller elbow internal and external rotation angle(p<0.001)in the stroke time.Compared to the oblique-line and midcourt-line,straight line showed larger lower limb flexion angle(p<0.05),smaller adduction and rotation angle(p<0.05).Regardless of the line,men showed larger upper and lower limb joint flexion angles and smaller adduction and rotation angles(p<0.05),while women showed larger shoulder rotation angle(p<0.001);(2)The analysis of the results showed that different lines and genders interacted in the shoulder,elbow and ankle moments,hip and knee flexion moments,and adductive and abduction moments(p<0.001).There was a significant difference between the upper and lower limb joint moments under the three batting lines.Compared with midcourt-line and oblique-line,athletes of different genders showed a larger shoulder and elbow flexion and adductive and abduction moments in the straight-line(p<0.05).Regardless of the line,men showed a larger upper and lower limb joint flexion moments(p<0.05),smaller upper limb adductive and rotation moments(p<0.05).Conclusions:(1)The straight line elbow and knee flexion angle is larger than the oblique and midcourt line at stoke time.The straight line is more dependent on the flexion and extension of each joint,and regardless of the line,the male topspin forehand requires more lower limb flexion and rotation and shoulder flexion and abduction,while the female uses more elbow and shoulder rotation;(2).The upper and lower limb joint of the midcourt-line the straight line and the oblique-line.In the table tennis,midcourt-line may be an adjustment line between straight line and oblique-line,athletes and coaches can use the midcourt-line to train the straight line and oblique-line,help to better grasp the technical action in training.(3)Compared with straight-line and midcourt-line,oblique-line is longer,lower limb force needs greater potential energy to hit the ball out,more likely to cause the risk of lower limb injury.Suggestion: If hit the ball back into the straight line,in the course of batting can pay more attention to the upper limb flexion,and before the racket hit the ball appropriately to increase the shoulder joint.When hitting the ball back into the oblique-line,pay more attention to the outer rotation of the upper limb joint.In a word,the direction of the force should be consistent with the direction of the batting drop point.Men pay more attention to the upper limb small muscle group training,the upper limb internal outreach,internal extrovert muscle training.Women increase lower limb strength,stability and coordination exercises so much that they can better hit back at balls on different lines in the game and reduce the varying degrees of damage caused by changing lines.