The Three-dimensional Kinematic Analysis Of The Power Serve Technique Of The Young Tennis Players In Our Country

With the improvement of the general strength and the economic development, our sport project has been developing rapidly; especially the athletics lenel has ranked top in the world. However, the development of our tennis is relatively slow that it has never taken up a place in the world's top tennis occupation. Therefore the focus we should pay close attention is how to change this situation to improve the competitive level of tennis. There are many reasons that course the problem. The most important factor that influences the result of tennis development is the situation of adolescent's tennis development, and the tennis serves the technology to become restricts the bottleneck type weak link which our country tennis athletics movement level further enhances. "Youth are strong, strong China", the paper attempts to based on the development of adolescent tennis, aims at ulrimately promoting the whole national tennis development.The paper takes the Beijing Sports University Athletics Physical culture school's 12 young people men and women tennis athletes as the object of study serves vigorously the test, uses three dimensional high speed methods and so on photograph, movement image analysis and scene observation, to receives trying from the kinematics angle to serve the technical each stage essential kinematics parameter to carry on the analysis, discovers general character question which in the technology exists, and pointed proposed the technical change measure as well as present's training suggestion.The Main conclusion:1) Our country teenager tennis athlete in serves the ball on fast to fall behind far the world advanced level, not only this does not favor our country tennis the reserve personnel training, does not favor our country tennis movement the further enhancement.2) Our country teenager tennis athlete throws a ball forward the contour interval is small, does not favor serves vigorously.3) Throws a ball the arm to be curving, shakes the wrist movement as well as throws a ball gets rid to select lowly is excessively throws a ball the subject matter which in the technology exists, thus creates throws a ball the arm to accelerate suddenly, causes to throw a ball the movement stable drop.4) Our country female teenager athlete throws a ball excessively high, causes "the flexure back" the movement to stop or the deceleration, destroyed has served the movement continuity, reduced has wielded pats the speed, did not favor is stretched the muscle to pull opens the contraction, created wields the racket to hit a ball the movement effort not to be uncoordinated.5) The lower limb lack of strength is affects the flexure back time knee joint pedal to extend the speed not quick most primary cause, simultaneously is also serves one of ball fast not high primary causes.6) The shoulder back flexibility is bad is causes our country teenager athlete "the flexure back" in the movement process "to surmount the instrument" the movement insufficiently obvious primary cause, does not favor the shoulder joint and the abdomen myo- group stretch as well as the muscle elastic potential energy reserve.7) Our country teenager tennis athlete to hits a ball opportunity assurance ability not to be good, the most athletes drop the time in the bodily center of gravity to hit a ball, create hit a ball somewhat low, affects serves the ball fast and the success ratio.8) Our country female teenager athlete the shoulder joint acceleration too lags in the forcibly order, creates the energy use factor the drop as well as the power chain transfer interrupt.9) In hits a ball the instantaneous racket speed aspect whole performance to be good, pats a maximum speed to appear before the hitting a ball time and reasonable hits a ball the time, conforms to kinematics principle which the tennis serves.