A Biomechanics Analysis Of The Final Phase For Man’s Javelinthrowers From Advanced Colleges In Shaanxi

This thesis applies high-speed cameras, telemetry EMG and three-dimensional force platform, these three machines simultaneously testing methods (have not be found). To analyze and process data of two athletes of the same level from the men’s javelin cross steps to the last shot moments with a special analysis software, human anatomy, sports training, biomechanics and other disciplines of knowledge, concerning kinematics, electromyography and kinetic theories. By contrast, problems and gaps are found in their final throw technologies. Afterwards, a technical diagnosis is made about this case in the hope of providing theoretical support for enhancing training progress and facilitating the current teaching models.The results are as follows:I. kinematics aspect:1. A study is made of the buffer stage in the final phase showing that Zhou**takes more buffer time than Lin**and needs more practice to improve the buffer technology. Training progress can only be made based on the reduction of buffer time and the application of buffer technology. Although Lin**takes less time than Zhou does, he should do more relevant exercise concerning the effective use of the buffer stage such as how to actively give force and do better than equipment, etc.2. When the javelin athletes stretch during the supporting phase, they should stretch the back foot fully and make the forward foot’s bearing great enough to ensure the fully open hip angle and well preparations for the largest "full bow" in the next step, which makes it easier to obtain the former acceleration from the initial phase.3. The speed range of all the left body joints is getting smaller from the cross step to the last shot while the speed range of all the right body joints is growing greater, which indicates that the active force will become active buffer from the initial run-up to the maximum value for all the left body joints, thus making necessary speed reserve for the greatest "full bow" beyond the equipment for all the right body joints. All the right body joints undertake more and more actions while the left body joints gradually descend. The speed of the upper limb comes from the active force of the legs and the momentum transfers from the legs to the upper limb in proper order, reaching the maximum value in the final shot. Ⅱ. Muscle mechanics aspect:1. The lower middle gastrocnemius muscle with electric values decrease gradually from the left to the oblique muscle belly first appeared EMG signals start, muscle flesh report in turn upper limbs to activate, that the power of the upper limb at this time from the active and lumbar abdominal muscle send force;2. In Zhou’s pedal out, lower support phase from the stage of the experience gastrocnemius lost live to be activated again to support after the process of forming the deactivation, in turn up quadriceps after complete power also weakened buffer;3. In the process of the paragraph from muscle integral muscle power audio-visual value, we can see that the second passage right triangle muscle in central and the right channel8quadriceps is the contribution rate of19%, it is also in the javelin movement of the arm muscle group with lower limb muscle group of major muscle send force, in the later training not only to continue to strengthen the two parts of the muscle practice, but also pay attention to participate in the training of the whole muscle.Ⅲ. Dynamic aspects:1. In the last strength phase of his right foot dynamics analysis by weeks of Zhou**of trend diagram analysis in Fy that no matter or in the stress of the third stage the Fz effort more fully, to make moves play, scores more ideal. Lin**is the first stage in the last send force buffer in the second large force that activate hair when force is less than the first wave hard, so from the whole offset off part of the momentum, and so Lin**in the last strength buffer stage should pay attention to the sustainable and action of strength and speed reasonable transformation, whose action technology needs further improved.2. Last strength in the dynamics of the left foot of technology Zhou’s left foot Fy direction than the older Lin’s hard, Zhou**for1978.05N, Lin**for1805.74N. The more obvious is Zhou’s hair force to short time in Lin**, Zhou**hit a peak time is0.50S, while Lin**are in0.46S, explain Lin’s left foot in support of hair on force more passive, Zhou**might be more active;3. In the last strength in the entire process of the phase I left foot stress comparison, in Fy stress direction on my left foot peak of1978.05N than the1132.87N of his right foot, in the last strength in the entire process stage left foot peak times and there is "full bow" form the moment after shots, this moment left foot peak and more stress that week in last strength phase of the forces of cohesion and transition is more reasonable.