Study On Evaluation Scheme Of Baseline Stroking Technique Of High Level Men’s Tennis Players

Baseline hitting technique is the basis of the development of tennis.It is the most common technique used by players except serving and receiving in modern tennis competition.Assessment is an important work to evaluate the quality of classroom teaching and students’ learning effect,and technical assessment is an important means of tennis course assessment.At present,the sports training tennis special course assessment still adopts the standard plus skill assessment mode.The standard part is due to the lack of validity of the assessment content,which can not effectively reflect the learning effect of students or distinguish their skill level.The technical evaluation part is greatly influenced by subjective factors such as teachers’ experience and experience,and the evaluation is often lack of reliability.Therefore,it is necessary to optimize the technology evaluation method,improve the reliability and validity of the evaluation,and then effectively evaluate the technical level and learning effect of students,so as to promote learning and teaching by testing.In recent years,with the expansion of enrollment scale and the change of student source structure,the overall technical level of tennis students in sports training major has been declining.Many students enter the school without strong special skills,which are far from the requirements of the training objectives.Therefore,in order to better train students to close to the requirements of training objectives and training specifications,it is necessary to explore a new bottom line technology evaluation model.Based on literature research,this paper establishes the evaluation index system of batting technique based on batting quality by means of expert interview and questionnaire survey.Combining with the evaluation index system,we have set up 9evaluation items and compiled standardized evaluation programs by referring to the previous research results.Collect the measured data of the evaluation scheme through testing method;Through data processing and analysis,the reliability and validity of the evaluation scheme are tested and the evaluation criteria are made.There are three first-level indicators: hitting quality under attack,stalking and defense,and nine second-level indicators: hitting speed,landing accuracy and return rate under three first-level indicators.Through the scoring items in the questionnaire,all levels of indicators are given weight.The Kolonbach Alpha coefficient of the questionnaire was 0.845,which indicated that the questionnaire had good reliability.The contents of the questionnaire were widely solicited from experts in the field of tennis teaching and training,and the questionnaire was completed under the guidance of experts in the field of psychological measurement.The questionnaire was filled in anonymously and recovered.The respondents were highly related to this study,and the above measures jointly guaranteed the effectiveness of the questionnaire survey.On the basis of the established evaluation index system,nine baseline test items were set up in combination with the technical requirements of tactics in the competition(the test of the diagonal line,the small diagonal line and the straight shot technique under the offensive situation;Stalemate in the oblique,small oblique,straight and middle hitting skills test;Tests of cross-line and midfield hitting skills in defensive situations);Based on the principle of objectivity,a standardized evaluation scheme was developed:the service machine was used to simulate the rounds under the situation of attack,stalemate and defense;the precision target of the drop point was developed to measure the precision of returning the ball;and the speed of returning the ball was measured by the speed measuring instrument.Thirty-seven male tennis students majoring in sports training were recruited to participate in the field test of the evaluation program,and the students were divided into a higher level group(18)and an ordinary level group(19)according to whether they had the experience of participating in college tennis matches at or above the provincial level.The test was carried out in two tests,with an interval of 4 weeks.The objects,contents,methods and processes of the two tests were identical.Thirty-four students from Chongqing Normal University who were asked to take part in the test completed a circular singles competition and recorded their rankings.Data collected in the test will be processed.1.The maximum value normalization method was used to remove the dimension of the test data to calculate the total score of the test.2.K-S test was used to check the distribution of test data,and the results met the normal distribution.3.Paired sample T test was used to check the correlation between the two test data.The test results showed that r=0.993,P<0.05,the correlation was high and significant,indicating that the evaluation scheme had good reliability.4.The independent sample T test was used to check the test data of the higher level group and the lower level group in the experimental subjects.The test results showed that T=7.943,P<0.01,the scores of the normal level group and the higher level group were significantly different,indicating that the evaluation scheme had high validity.5.The Spearman correlation coefficient was used to test the degree of correlation between the ranking of test data and the ranking of cyclic matches.The results showed that: r=1,P<0.01,the ranking of matches was significantly positively correlated with the ranking of test scores,which also indicated that the evaluation scheme had a high efficiency.6.Using the method of deviation,we have made a comparison table of the score of base-line hitting technique within the range of plus or minus 2.5 standard deviations,and converted the dimensionless total score into a hundredth score.Developed by the research results show that the evaluation indexes and the scheme has good reliability and validity of the assessment content reflects the high level tennis competition demand and the difficulty of the baseline technology properly,can effectively distinguish between students’ technical level,test process is relatively simple operation,can be applied to sports training tennis special skill courses for students in the bottom line technology evaluation and diagnosis.