Application Of Video Analysis In Teaching Diagnosis Of Basic Techniques Of Tennis Forehands

The bottom line forehand technique in tennis is an important technical link in the game.According to statistics,more than 70% of hits come from the forehand,so the bottom line forehand technique should be used as an important training content in school teaching.Tennis bottom line forehand technique is one of the basic techniques of tennis.It is necessary to effectively diagnose,evaluate and monitor the bottom line forehand technique in teaching and training.This article uses the literature method,expert interview method,expert evaluation method,video analysis method,case analysis method,and data processing method.The bottom line forehand technical action of tennis is taken as the research object.The specialty students of undergraduate tennis of the School of Athletic Sports are the sample of the research model.The students of the 14 th class of the 2017 undergraduate tennis program of the College of Education are the technical diagnosis objects.The following conclusions are analyzed and concluded:⑴ According to the correlation between the bottom line forehand technical indicators and the batting effect,a key index system for the bottom line forehand diagnosis was established.The back swing lead-in period includes three indexes: the shoulder joint angle,the hip joint angle,and the right knee joint angle.The swing stroke phase includes two indicators: the angle of the racket and the angle of the left knee joint.⑵ Based on the average modeling method and scoring evaluation method,a bottomline forehand technical model and a technical action score evaluation form were established,which were used in the diagnosis of tennis bottom-line forehand basic technology teaching,which provided teachers with a solution to students’ technical movement problems.New solutions.⑶ Among the key indicators of the backswing stage,the proportion of people with differences in the shoulder joint angle,hip joint angle,knee joint angle,and model parameters at the end of the post reaches 100%,80%,and 100%.Among the key indicators of the stage,the percentage of people with significant differences in racket angle,knee joint angle index and model parameters at the time of hitting the ball reached 100%.In terms of technical action scores,the proportion of those who reached 50% of the model at the back swing stage was 20%;the proportion of those who reached 50% of the model at swing stage was 0.⑷ From the diagnosis results,it can be seen that after comparing with the established model,the students as the diagnosis object have some problems in different aspects,such as: at the end of the draw,the angles of the shoulder,hip,and knee joints are not enough.This caused the problems of insufficient preparation and insufficient charge,which made the depth of the shot insufficient.During the swing stroke,the angle of the slap and the angle of the knee joint at the moment of the stroke are not in place,resulting in problems such as unstable ball control,unsmooth force and movements.⑸ Using Dartfish video analysis software in the teaching of tennis bottom line forehand basic technology can effectively help teachers improve teaching efficiency and help students master technical movements faster and more accurately.Zhang *,Zhang zhi *,Zhang **’s bottom-line forehand technical indicator parameter total scores accounted for more than 50% of the total technical score of the model,and the technical scores have increased significantly,especially the key technical indicator scores.The batting effect has also been improved,and technical problems in the diagnosis of the initial state have been improved.Although xue ** and Peng **’s technical points have also improved,the improvement in key technologies is not obvious,resulting in a result that the goal rate is not high.