Investigation of Kinematics of Knuckling Shot in Soccer
Investigation of Kinematics of Knuckling Shot in Soccer
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足球中指节射门的运动学研究
DOI：
10.1117/12.2269157
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S.
中科院分区：
文献类型：
--
作者：
Asai;T. & Hong;S.
在这项研究中，我们使用四个高速摄像机来研究足球比赛中踢球时腿的摆动特征。通过与直击球和弧线球的比较，试图阐明踢球脚在击球瞬间的击球过程和指节击球的技术机理。两个高速摄像机(Fastcam，Photron Inc.，日本东京；1000帧/秒，1024×1024像素)安装在距离撞击现场2米的地方，视线垂直于踢腿一侧。此外，还放置了两个半高速摄像头(EX-F1，日本东京卡西欧计算机有限公司；300fps；720×480像素)，一个在后面，另一个在踢腿一侧，以捕捉踢腿运动。我们观察到，在指节击球中，踝关节在撞击时以近似L的形状弯曲，其方式类似于曲线击球时的关节弯曲。在指节击球中，髋关节的外旋转扭矩比其他击球的大，这表明踢球者有向前推脚跟并与脚部内侧碰撞的倾向。指节射门的攻角比其他射门的攻角小，我们推测这种小的攻角是足球踢球的一个因素，足球踢球产生的球的旋转频率较小。
In this study, we use four high-speed video cameras to investigate the swing characteristics of the kicking leg while delivering the knuckling shot in soccer. We attempt to elucidate the impact process of the kicking foot at the instant of its impact with the ball and the technical mechanisms of the knuckling shot via comparison of its curved motion with that of the straight and curved shots. Two high-speed cameras (Fastcam, Photron Inc., Tokyo, Japan; 1000 fps, 1024 × 1024 pixels) are set up 2 m away from the site of impact with a line of sight perpendicular to the kicking-leg side. In addition, two semi-high-speed cameras (EX-F1, Casio Computer Co., Ltd., Tokyo, Japan; 300 fps; 720 × 480 pixels) are positioned, one at the rear and the other on the kicking-leg side, to capture the kicking motion. We observe that the ankle joint at impact in the knuckling shot flexes in an approximate L-shape in a manner similar to the joint flexing for the curve shot. The hip’s external rotation torque in the knuckling shot is greater than those of other shots, which suggests the tendency of the kicker to push the heel forward and impact with the inside of the foot. The angle of attack in the knuckling shot is smaller than that in other shots, and we speculate that this small attack angle is a factor in soccer kicks which generate shots with smaller rotational frequencies of the ball.