Analysis Of The Rotational Speed Of The Rhythm Of The Elite Women’s Discus Throwers

Objective:kinematics analysis is an important means for the movement of technical analysis and diagnosis, with the development of science and technology, three-dimensional image analysis technologies have been advanced, Chinese scholars on women’s discus throw kinematic characteristics of the rotational speed of the rhythm a lot. kinematic characteristics of meaningful research, however, most of these kinematic study of the following disadvantages:the past, the rhythm of the rotation speed is relatively simple, it is difficult enough into the system; because of the lack of systematic study, so the vast majority of contrast the lack of consideration than the of study; the limitations of the research equipment, image acquisition is frequently used in constant speed, while the discus is a high-speed rotation projects, so often the results to reach the expected depth and accuracy.The top eight female discus throwers of 2011 the second leg of the IAAF Diamond League points, the use of literature information through expert interviews, the three-dimensional method of camera, video analytic method for the quantification of, while the use of mathematical statistics and comparative law on the data collected for analysis.Research findings and the results are as follows:1, change the speed of the rhythm of the entire throwing process will affect the changes in the amount of technical movements and gestures.2, double-support phase, not only to control the speed of the rhythm, but also taking into account the athlete’s personal characteristics and style.Single-support phase of the used absolute time to analysis, this stage of athlete movement speed of the rhythm of relatively fast, however, from the relative time of the local site to analyze, constantly change the "action balance the axis of rotation", athletes left cross the average The speed of the smaller, will result in the chaotic rhythm of the speed of the local athletes body parts.4, to analyze, from the perspective of the flight phase, the action demonstrated by the absolute time values indicate that the slow rhythm of this stage of action, and to analyze the local parts of the movement of relative time, the right hip average speed for the right foot actively to and the left foot quickly to create the conditions placed landing.5, in the transitional phase of the final force, the absolute time of the athletes is relatively small, the action technology is also relatively fast, however, the relative speed of the previous stage of the discus centroid is declined, indicating that this stage of the speed loss. This is a "dynamic equilibrium axis of rotation body of the second stage. From the relative time to analyze the average speed of the right hip to be less than the average speed of the right shoulder, which resulted in their time inconsistency, the performance of the irrationality of the local movement speed rhythm, can not form a good beyond the equipment.6, in the final stages of force from the hand speed, absolute time and angle data obtained show that the conditions have a very high level of shot height should take into account individual differences of athletes, however, from the local parts of the movement of the relative time to analyze the average speed of the athletes left shoulder, showing the inconsistency of the local parts of the body relative time, rhythm chaos, it is easy to cause the left shoulder to open too early, and not a good use of the power of human core.Complete the process of throwing technology, pre-placed in the transition phase of the Final Push, the trend of the body center of gravity speed rhythm and discus the speed of the centroid rhythm trend is the same, and the last hard stage the opposite. Trend in the discus the average of the centroid velocity curve:fast-fast-fast-slow-fast; manifested in the proportion of the average time of complete throwing technology:the longest-longer-the shortest-short-long an average time pro rata.