Miran Pašić, Tarik Huremović, M. Muratović, D. Džibrić, Amer Hodžić, Davor Arnautović, Aljoša Delić, Miro Lušić
{"title":"DIFFERENCES IN KINEMATIC PARAMETERS BETWEEN FIRST AND SECOND SERVES IN\u0000TENNIS BY ELITE PLAYERS OF THE GERMAN LEAGUE","authors":"Miran Pašić, Tarik Huremović, M. Muratović, D. Džibrić, Amer Hodžić, Davor Arnautović, Aljoša Delić, Miro Lušić","doi":"10.51558/1840-4561.2023.20.1.53","DOIUrl":"https://doi.org/10.51558/1840-4561.2023.20.1.53","url":null,"abstract":"The primary goal of this research was to determine the differences in kinematic parameters between the first and second\u0000serves in tennis among the elite players of the German league. The sample of respondents in this research consisted of 30\u0000elite male senior players of the German League who have \"Leistungklasse\" from 1 to 7. The kinematic parameters that\u0000were analyzed are: Height of ball impact (KPVUL), Racket speed (KPBRE), Ball speed (KPBLO), The angle at the elbow joint of\u0000the arm that hits the ball (KPULZ), Oscillation of the vertical projection of the center of gravity of the body (KPOVP), Jump\u0000height (KPVSK), Ball launch height (KPVIL), The point of contact between the ball and the racket \"sweetspot\" (KPMLR), Ball\u0000rotation \"Top spin\" (KPRLO). The video recording required for kinematic analysis was acquired with two Casio EX-F1 digital\u0000cameras at a frequency of 200 images per second. The camera was placed at an angle of 900\u0000in relation to the recording\u0000plane, and they were at a distance of 10 m. Space calibration was performed with the help of a calibration frame (200 x 200\u0000cm). We have installed Zepp Tennis Smart Sensor 2.0 in the handle of the Wilson Pro Staff RF97 Autograph racket, using the\u0000Zepp Tennis application software. \"Kinovea\" software was used for service analysis and obtaining kinematic parameters\u0000from video recordings. By analyzing the results of the T-test for independent samples, it can be seen that there are\u0000statistically significant differences in five of the nine analyzed kinematic parameters : KPBRE – kinematic parameter of\u0000racket speed (Sig.=.000), KPBLO – kinematic parameter of ball speed (Sig.=.000), KPULZ – kinematic parameter angle in the\u0000elbow joint (Sig.=.000), KPMLR – kinematic parameter point of contact between the ball and the racket (Sig.=.000), as well\u0000as a variable KPRLO – kinematic parameter of ball rotation (Sig.=.000). Larger numeric values in variables: KPVUL –\u0000kinematic parameter ball impact height, KPOVP – kinematic parameter of oscillation of the vertical projection of the center\u0000of gravity of the body, KPVSK – kinematic parameter jump height and KPVIL – kinematic parameter ball impact height, show\u0000a difference but it is not enough to be statistically different.\u0000Key words: tennis, kinematic analysis, racket speed, Zepp sensor","PeriodicalId":249361,"journal":{"name":"Sport Scientific And Practical Aspects: International Scientific Journal of Kinesiology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121423482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}