The Time-image Kinematic Analysis On The BF Move Of Li Nina In Freestyle Skiing Aerials

This research attempts to obtain technical parameters of kinematics from the jump in the 3600-somersault of the bF move till the end of the move by means of image measuring method applied to Li Nina, a world champion in the Olympics and international competitions, for the purpose of revealing the structural regularities of this move, pointing out the correct pose and the best time for the jump in the 3600-somersault till the end of the move in the freestyle skiing aerials, and determining the impacts of the new rules upon this move through analytical descriptions of kinematics features of the freestyle skiing aerials so as to provide theoretical basis for scientific training. Moreover, it is of great importance to make a study on the starting jumps since there are hardly any thorough analysis and professional researches. In terms of getting medals, Li Nina got the Second Place and Han Xiaopeng got Champion in this item of Turin Olympics, 2006. This proves that the freestyle skiing aerials in China have been developing rapidly in the recent years, which indicates that many potential athletes in China are in the hope of getting the gold medals.This paper serves to analyze the angles and the velocities of such joints as knee joints, hip joints, shoulder joints and elbow joints, and then point out the changes in the gravity resultant velocity of the athletes from the jump in the 3600-somersault till the end of the move. This paper also aims at illustrating the right time for turning of those excellent athletes in the world and their correct pose by means of making kinematic analysis of this technique, so as to make the coaches and athletes understand the structure and technique of this move more fully and to make the training more scientific.At the end of this paper, the following conclusions are drawn.1. In terms gravity resultant velocity, the level speed of leaving the platform should be increased in order to gain the reasonable vertical speed and rising height.2. Athletes can finish bF move with fully straight body in the place of the clock between 11 and 1.3. Ankle joints are not completely in where it should be at 0.2 second. Right shoulder joints are not opened entirely.