| （1.Department of Physical Education，Guizhou University，Guiyang 550025，China；2.Graduate Department， Guangzhou Sport University，Guangzhou 510500，china） Abstract: By using methods such as video analysis, the authors studied the characteristics of movement structure and speed variation of the torso turning in the process of final shot putting power explosion in the backward sliding move of 2 excellent male shot putters in China, and revealed the following findings: at the final power explosion stage, the resultant velocity of the right hip of the putters was increasing generally, and decreasing quickly after the peak velocity was achieved; the turning amplitude of the shoulder and hip axes at this stage were much greater than the same at the transition stage; in the mean time, the turning velocity of the shoulder and hip axes were all increas-ing quickly, the turning velocity of the shoulder axis was significantly greater than the turning velocity of the hip axis, but the hip axis achieved the peak velocity prior to the shoulder axis; the torso movement was a kind of com-plex movement of orderly turning while the torso was dashing forward; the resultant velocity of the right shoulder tended to decrease at the t1–t2 stage; at the final power explosion stage, the velocity of the body center of gravity in the OY direction decreased quickly, the velocity of the body center of gravity in the OZ direction increased rapidly, while the velocity of the body center of gravity had the least effect on the resultant velocity of the body center of gravity.
Key words: sports biomechanics；shot putting；final power explosion；torso movement；kinetic analysis；China |
