再论推铅球的最后用力

在对推铅球最后用力概念界定的基础上 ,重新划分推铅球最后用力的阶段。查阅了国内外有关的文献资料 ,在此基础上进行数理统计分析 ,提出了划分推铅球最后用力阶段的新理论 :推铅球最后用力阶段是从支撑脚着地后积极蹬伸产生向前水平支撑反力开始到铅球离手的过程。整个最后用力阶段分为单支撑和双支撑 ,单支撑最后用力阶段对左趾向前水平位移、身体重心速度水平向前增量有积极的作用 ,促进左脚积极着地进入双支撑最后用力阶段。在训练中选择提高下肢离心 -向心收缩能力的练习 ,提高力量训练效果。

Rethinking on the Final Exerted Throwing of Shot Put

After defining the concept of the final exerted throwing, the author newly divided the final phase of delivery. Based on foreign and domestic documentary material, the author made a statistical analysis and put forward the new idea of division of the final phase of delivery. The final phase of delivery begin with the right leg touchdown ground while the right leg actively stretch and produce the forward support revolt strength. The whole process of the final phase of delivery should be divided into two courses, that is the single leg and double legs uphold course. The single leg process of the final phase of delivery had positive affect on the forward level displacement of left leg and the gravity increment of body center, promoted left leg touchdown ground coming into double legs uphold course. During the training, we should select reasonable method to improve specialized strength, enhance the effect of strength training.