Effect Evaluation And Optimization Of The Monitoring Method Of Rowing Technical Training

The scientific monitoring of rowing technical training is particularly important,it is an important sign of the scientific level of rowing technical training,and it is always an important issue concerned by theory and practice.At present,the video,real boat biomechanics,surface myoelectric and comprehensive monitoring methods of rowing technical training have made rich achievements in the research of rowing technology,but there are some problems in practical application,such as low benefit,analysis and evaluation technology is not comprehensive and accurate,and cumbersome,difficult to operate and time-consuming.Therefore,the purpose of this study is to evaluate and optimize the effects of video,real boat biomechanics,surface electromyography and comprehensive methods of rowing technical training,in order to better apply to the practice of rowing technical training monitoring.Research methods:The development of video,real boat biomechanics,surface myoelectric and comprehensive methods for technical training monitoring of rowing were systematically sorted out by using the literature data method,and the advantages and disadvantages of different monitoring methods and application effects were preliminarily analyzed.Eleven male public high-level athletes were selected to perform multiple rounds of incremental paddlefrequency and full strength 2000 m simulation tests at the sports training site,and mathematical statistical methods such as mean comparison and test,linear correlation analysis,independent sample t test,paired sample t test,and factor analysis were used for processing,and the effects of different monitoring methods were empiratically evaluated.On this basis,an innovative monitoring method for rowing technology training was constructed and optimized through literature review,expert interview and field testing of sports training.The new method was applied to monitor the two teams(12 men and 15 women)respectively,and methods such as mean comparison,paired sample T-test and logical analysis were applied.Comparing the change degree of the technical index of the two teams after using the technical training monitoring in the actual training,testing the practical application effect of the optimized rowing technical training monitoring method.Research results:(1)The biomechanical monitoring method can effectively feedback biomechanical data in incremental paddle frequency and simulated 2000 m test,and can be applied to technical analysis.The kinematics indexes such as pitch frequency,pulling time,average pulling speed and maximum thrust speed of all athletes and cases were significantly correlated with boat speed(P < 0.001,r=0.58～0.96).In terms of dynamics,the average paddle force,the average paddle force/body weight,and the range of reaching 70% of the maximum paddle force were significantly correlated with ship speed(P < 0.01,r=0.38～0.53).In terms of power and work,the paddle power was significantly correlated with ship speed(P < 0.001,r=0.56～0.94).Under the condition of race paddle frequency,the parameters of paddle frequency,power of one paddle,average paddle handle force,pull amplitude,water slip,kick length of all athletes were significantly different from the "gold standard"(P < 0.001).In this study,the 6 factors in the index system jointly explained 88.529% of the total variance of 26 indicators.The six factors of "action speed","trajectory of the paddle","pulling power","action amplitude","discharge efficiency" and "entry efficiency" explained 39.273%,20.588%,9.991%,7.485%,6.278% and 4.916% respectively.(2)The surface electromyography monitoring method can be effectively applied to rowing training practice and reflect the muscle activity of rowing technical movements.In all athletes,the mean RMS of medialis muscle,erectus muscle,biceps muscle and all pull-driving muscles were significantly correlated with boat speed(P < 0.05,r= 0.82-0.99).The RMS of medialis femoris muscle was significantly correlated with ship speed in both increasing paddle frequency and full force 2000 m tests(P < 0.05,r= 0.71-0.96).However,there was no significant correlation between the driving muscle RMS of all athletes and the boat speed in the test of increasing paddle frequency and full force 2000m(P > 0.05).(3)The comprehensive monitoring method can fully reflect the rowing technology from kinematics,dynamics,power,muscle activity and other aspects.In the incremental pitch frequency test,the pitch frequency of all athletes was significantly correlated with pulling time,average pull speed,average handle force and pull amplitude(P < 0.001,r=0.41～0.95).The power of each oar was significantly correlated with the pull amplitude,average handle force and average pull speed(P < 0.01,r=0.39～0.93).The average shaft force was significantly correlated with pulling amplitude,maximum shaft force and 70% maintenance amplitude of maximum shaft force(P < 0.01,r=0.32～0.88).The mean RMS of all pulling muscle was significantly correlated with one paddle power,maximum paddle handle force and average paddle handle force(P < 0.05,r=0.68～0.90).The propeller force curve,the speed curve of different parts of the body,the RMS curve and proportion of the driving muscle of different parts of the body and the key technical pictures were presented comprehensively,reflecting that the propeller force curve was not full and smooth due to the premature force of the arm and the insufficient force of the vertical spine muscle.(4)Through the expert interview,the monitoring method of rowing technical training was optimized,which was unanimously recognized by coaches and athletes after application,and the application was more convenient and the understanding of technology was more comprehensive and deeper.The technical indexes of the athletes of the two teams,such as ship speed,paddle frequency,power of one paddle,pulling time,pulling amplitude,average pulling speed and average paddle handle force,all have significant changes in different degrees.Research conclusion:(1)The biomechanical monitoring method can reflect the effect of rowing technology from kinematics,dynamics,power and work,etc.,but it can not reveal the cause of technical index problems.However,the widely used "gold standard" technical index system ignores the "action speed" index,adding the average pulling speed,pulling time and rowing rhythm index can better reflect the boat speed and rowing technology.Paddle frequency,power of one paddle,average pull speed,average pull force,pull time,pull amplitude and other indicators can be used as key technical indicators to analyze and evaluate rowing technology,which is more targeted in practice.(2)The application of surface EMG monitoring method in rowing technical training can reveal the movement characteristics of athletes’ different muscles to reflect the effect of rowing technical training,but there are still some problems such as cumbersome and time-consuming monitoring method.For individual athletes,the larger the RMS value of the main force muscle,the more beneficial it is to promote the boat speed,and the strength of the quadriceps muscle is more critical to evaluate the technical effect.The effect of the RMS value of the main force muscle reflecting the boat speed can be applied to the longitudinal comparison of individual athletes,but it is not recommended to apply to the horizontal comparison between athletes.In practical application,surface EMG can be used as a method to reveal the cause of problems in rowing training.(3)The technical index of man-paddle-boat system in rowing training can be realized by using video,biomechanics and surface myoelectric monitoring methods,but it is often used in practice,which is cumbersome and difficult to operate,and will bring interference to the overall training arrangement.This study further systematically reveals the relationship between the technical indicators of different monitoring methods,so that the analysis is more comprehensive,targeted and simple.For the key technical problems such as insufficient full and smooth paddle power curve and insufficient power of athletes,RMS curves of muscles in different parts of the body and contribution ratio can be used to reflect the causes of technical problems.Combined with video analysis,the appearance of the technology can be visually and visually reflected,so as to facilitate a comprehensive understanding of the technology.(4)The "combinatorial optimization" type monitoring method of systematic rowing technical training in a certain stage has been optimized and applied to practice with good results.After the application,the athletes’ boat speed is improved significantly.The key technical indexes,such as paddle frequency,pulling time,average paddle handle force and power of one paddle,which reflect the ship speed,play an important role in improving the ship speed.Systematic analysis and evaluation of rowing technology is helpful for coaches and athletes to understand rowing technology comprehensively and accurately.The comprehensive application of different monitoring methods can reveal the technical training effect of different training concepts and determine the training direction.Once again,it is proved that the "moving speed" index has a more significant effect on improving ship speed.(5)In the practical application of different rowing technical training monitoring methods,the advantages and characteristics of different monitoring methods should be combined with the development laws of rowing training and technical training and the phased purpose of training,and the testing,analysis and evaluation time of different monitoring methods should be reasonably combined to form a "combinatorial optimization" type monitoring method for systematic rowing technical training in a certain stage.It can improve the scientific level of technical training and monitoring of rowing.