Sforza Chiarella, Turci Michela, Grassi Gian Piero, Shirai Yuri F, Pizzini Giuliano, Ferrario Virgilio F
ISEF Lombardia Università degli Studi di Milano, Functional Anatomy Research Center, Dipartimento di Antatomia Umana, Facoltà di Scienze Motorie, Italy.
Percept Mot Skills. 2002 Oct;95(2):433-44. doi: 10.2466/pms.2002.95.2.433.
In karate, performance also depends on a correct body shape, and the repeatability of standardized movements conditions the effectiveness of techniques. The execution of mae-geri-keage (frontal snap kick) was studied in 13 karateka (1st-5th dan). The 3D trajectories of 13 body landmarks were analyzed by an optoelectronic instrument while each karateka performed 10 repetitions of the movement. For each karateka and repetition, the standard deviations of the spatial coordinates x, y, z for each landmark were computed. A total standard deviation of the single participant was also calculated. Two experienced karateka performed with the best repeatability (smaller standard deviation) while executing the studied kick. Generally, the best repeatability was observed in the horizontal plane. The lower variability was observed in hips and head. Ankle and knee of the dominant limb had the worse. The method could detect athletes particularly gifted for the discipline. Moreover, it could help in the identification of those parts of body that do not repeat the movement with the desired precision.
在空手道中，表现还取决于正确的身体形态，标准化动作的可重复性决定了技术的有效性。对13名空手道运动员（初段至五段）的前踢（mae-geri-keage）动作进行了研究。在每位空手道运动员进行10次该动作重复时，通过光电仪器分析13个身体标志点的三维轨迹。对于每位空手道运动员和每次重复动作，计算每个标志点空间坐标x、y、z的标准差。还计算了单个参与者的总标准差。两名经验丰富的空手道运动员在执行所研究的踢腿动作时具有最佳的可重复性（标准差较小）。一般来说，在水平面观察到最佳的可重复性。在髋部和头部观察到较低的变异性。优势肢体的脚踝和膝盖变异性最差。该方法可以检测出在该项目上特别有天赋的运动员。此外，它有助于识别身体中那些没有以所需精度重复动作的部位。
