Abstract
By using three-dimensional video analysis, we made a kinematic analysis on Grigor Dimitrov’s Serve technique, aiming at finding the kinematic characteristics of his serve technique during various stages. The results showed that: (1) During the stage of tossing the ball and lifting the racket, the tossing height of the ball was at minimum appropriately, while the elbow extension of the tossing arm was stright, and the angle of his left knee was 95.4°, which is beneficial to making greater kicking power; (2) At the back-swing stage, Dimitrov’s both feet made a great range of pedal and stretch quickly, and the “scratch-back” posture is obvious, and momentum caused by the kicking and coxae-turning was rather large; (3) When hitting the ball, the contact point was accurate and the speed of the racket head was high, which passed a relatively large initial momentum to the ball; (4) Dimitrov’s entire service action was integral and coordinate, smooth and powerful, which was in accordance relatedly with kinematic characteristics
Highlights
This paper use three-dimensional video analysis method to make corresponding exploration and analysis on the serve technique of the 2014 China Open men's tennis player GrigorЬDimitrov, so as to reveal the serve technique mode of the world’s excellent potential tennis players, which can provide reference for coaches and athletes, strengthen serve training and improve serve techniques as well as enrich theoretical knowledge of the serve techniques
1.2 Methods 1.2.1 Three-dimensional video analysisAt the game site of the 2014 China open,we used two JVC9800 cameras shooting frequency:50fpS, to shoot the entire serve techniques of GrigorЬDimitrov.Camera 1 was right behind the side line of the tennis court, camera 2 right in front of the base line, showing an included angle about 45ebetween main optical axes of the two cameras(as is shown in Figure 1). the exertion videos were analyzed by the 3D Signal TEC V3.2HDC software, frame by frame
According to the need of the research, we divided his serve techniques into the following four stages: 1) The tossing ball and lifting racket stage (Stl): the moment when ball and racket were separated (BRsep) to the moment when knee flexion reaches the maximum (KFmax); 2) The backward-swing stage (Sbs): the moment when knee flexion reaches the maximum to the moment when racket reaches the lowest position behind (Rlowest); 3) The swing upward at the ball stage (Ssu): the moment when racket reaches the lowest position behind ("scratching-back" position) to the moment when hitting the ball(Hball); 4)The following-through stage (Sft): the moment when hitting the ball to the moment when his left foot touch the ground
Summary
This paper use three-dimensional video analysis method to make corresponding exploration and analysis on the serve technique of the 2014 China Open men's tennis player GrigorЬDimitrov, so as to reveal the serve technique mode of the world’s excellent potential tennis players, which can provide reference for coaches and athletes, strengthen serve training and improve serve techniques as well as enrich theoretical knowledge of the serve techniques.
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