The Research Of Our National Elite Female Combined-events Athlete Haili Liu's Javelin Throwing Technique Kinematic Characteristic

Research Purpose: Liu Haili, national excellent all-round athlete in Shenyang Sport University, has a big gap in total grade compared with other world's outstanding heptathletes. The individual event such as throwing makes great difference to her final scores. To provide the basis for scientific training, this thesis synthetically evaluated temporal-spatial features of Liu Haili's javelin technique by quantitative analysis from the perspective of kinematics.Research Method: Liu's javelin throwing movement was filmed by two SONY cameras and analyzed by APAS photographic analysis system. The data gained was statistically analyzed by SPSS10.0 and EXCEL office software.Research Outcome:(1)During her six times throwing, apparent differences existed in her technical movements due to technical instability. (2) Although her run-up speed is high, her excessive speed loss rate and unsuccessful join of cross steps made her poorly prepared for the final effort. (3) Her fast body speed and big forward momentum resulted in the small angle of her torso backward, so the power of final thrush is not enough. Consequently, the final thrust was not well enough. (4)During the final thrust phase, the time her right foot landed for buffering and transiting to stretch lasted too long, so the momentum transmissibility and braking was impacted. (5)The velocity of body gravity lost too much at the last step. (6)The moment when she landed left foot and threw out javelin, the small angle of left knee led to the result that her left support was not well enough, and because her upper body made power earlier, the torque of her arm throwing was shortened.