The Kinematic Analyzes On Backward-slides-step-shot-put Technique Of Outstanding Female Shot-putters In He Bei

Shot put is the advantages of the project in Hebei Province where has cultivated several excellent athletes. The main purpose of this study is to analyze the skills of elite female athletes in our province to find out the advantages of their technology and shortcomings through the kinematic, and then provide a basis for future training contrarily.This study take four excellent women athletes from Hebei Province Athletics Management Center as target, using fixed set-distance three-dimensional photographic measurement to analyze the sports indicators from various stages of shot put . There are two Sony video cameras, frequency of 50hz, placed at the right side and left front. There are 110°angle between them. After that, this study analyzes the data on three stages of sliding phase, transition steps, finally forced phase through"Ariel"system.1 The time of sliding phase is relatively long in a part of female athletes in Hebei Province, the maximum speed for swinging his left leg appeared in the right pedal from the ground before, that is, tread in the right leg stretched the active phase. But some athletes in the right leg moment from the ground tread angle due to the body center of gravity vertical velocity is too large causing large, horizontal velocity is relatively small, so it will reduce the body's center of gravity speed and shot-put speed.2 In the transition phase, Gong Li Jiao's speed difference between the body center of gravity and shot speed is up to 0.76, and the difference at this stage is rising, at the same time indicating the extent of reversing her body relatively large. But Lili and Maqiao step in the transition stage left landing an instant, hips and shoulders did not form a large reversed, did not form a good position beyond the equipment.3 Subjects in the final stage followed the shot put principle. But some athletes got incomplete posture, and thus impact the speed of shot put.Recommendation:1.An object of study in the sliding phase to constantly improve technology, and strengthen his left leg swing, frog placed with, in the sliding phase to achieve the body center of gravity to the low pressure, action to be fast, the body center of gravity as far as possible not to have ups and downs, sliding as long as possible shortened.2. In the transition phase, this study give Maqiao some advices of enhance the braking effect of the left hip, right hip actively throwing training in areas such as the direction of rotation. The study should also suggest strengthen his left leg from the give way to the restraint in work changes. Shorten the transition time as far as possible to reduce the rate of loss. Training athletes to effectively control movement of awareness and capacity to establish its own characteristics that will help shape the technical driving force.3. Combined Athletes technical training with strength training of athlete. Focused on improving the capacity of fast twitch muscles in his right leg, grasp the power of his right leg hair the right time, highlighting the hip sway of technology, so let shot become low and away from the support points and increase the shot speed up with distance.4. Give advices for coaches and athletes according to athlete's own characteristics to fit their technical, which is bold to try and accept new things, like the relatively low height, flexibility and stability of the relatively good athlete, recommended rotational shot put technique, rotational shot put technique has its unique advantages.5. Pay more attention to action's simple and effective, give full play to technology, comprehensive benefits, each of them has its own technical characteristics, the technology which is suitable for someone, but it could not suite anyone. Technology is not only one necessary factor for athletes in their score, such as shot put shot angle and speed of their shot speed will be limited to a certain extent, not shot when more than 45°angle in the case, the bigger angle is the better shot put, because the bigger angle is, the less loss make. So, according to their's own throw characteristics, the effectiveness of play action is the most important.