Research On The Technique Characters Of Thenon-swing Lift Racket Serve In Tennis

In the game of tennis, the serve is recognized as the most important weapon.. It is also a relatively weak technique to tennis players in our country. through the research on the new serve named the non-swing lift racket serve will help to promote the tennis sport in China at a faster pace. Through observation and analysis the match video of world-renowned athletes with non-swing lift racket serve, sum up the distinctions between the non-swing lift racket serve and the swing lift racket serve. Selecting the test targets to imitate and learn the non-swing lift racket serve. By using two high-speed Mega cameras with shooting frequency of 300 frames per second and exposure time of 1/1000 second synchronization collecting the three-dimensional moving images information, and adopting the German SIMI-Motion Video Image Analysis System to analysis the images. The results showed that: (1)Compared with the swing lift racket serve, spiking point of the non-swing lift racket serve is farther to the athlete. the direction of the extension body is closer to the direction flight of the ball after hitting, is good for transfering power. (2)Compared with the swing lift racket serve, the station of the non-swing lift racket serve is propitious to jump, has a good jump effect, center of gravity has a faster speed, the direction of jump is more biased to the front. (3)the non-swing lift racket serve torsional amplitude, trunk fold angle is less than the swing lift racket serve, Which go against the power of waist and abdomen muscle group exerted. (4)Compared with the swing lift racket serve, the back bending depth of non-swing lift racket serve is shallow, and has short distance to work on the racket acceleration. But it is more of explosive power. The ultimate effect on acceleration of upper racket does not poor than the swing lift racket serve。(5)the time of the non-swing lift racket serve is short, and the rhythm is more compact, it is focus on the explosive power, the time of the swing lift racket serve is relatively long,and the rhythm is ease,which moves more stretch.