Comparison of support leg kinetics between side-step and cross-step cutting techniques
Comparison of support leg kinetics between side-step and cross-step cutting techniques
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DOI：
10.1080/14763141.2014.910264
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发表时间：
2014-01-01
影响因子：
2.2
通讯作者：
Fujii, Norihisa
中科院分区：
文献类型：
--
作者：
Suzuki, Yuta;Ae, Michiyoshi;Fujii, Norihisa
本研究的目的是调查侧步（SS）和交叉步（CS）切割技术与规定的908切割角之间的支撑腿关节力矩和力矩功率的差异。对20名男大学生运动员进行了SS和CS切割技术的地面反力（1, 000 Hz）和三维运动学（250 Hz）测试。SS技术的标准化峰值膝关节伸展力矩大于CS技术（SS为0.40 +/- 0.10; CS为0.26 +/- 0.08）。在SS技术中，膝关节伸肌（SS为-0.10 +/- 0.06; CS为-0.02 +/- 0.04）和踝关节跖屈肌（SS为-0.12 +/- 0.05; CS为-0.07 +/- 0.03）做了显著更多的负功（标准化）。在SS技术中，方向改变角（SS为40.5 +/- 8.7度; CS为33.0 +/- 6.8度）和质心水平速度的降低（SS为-0.63 +/- 0.23 m/s; CS为-0.31 +/- 0.23 m/s）显著更大。这些结果表明，SS技术是一种有效的手段，改变运行方向的质量中心的速度为代价，CS技术是更好地尽量减少质量中心的水平速度的减少。
The purpose of this study was to investigate differences in the support leg joint moment and moment power between side-step (SS) and cross-step (CS) cutting techniques with a prescribed 908 cutting angle. Ground reaction forces (1,000Hz) and three-dimensional kinematics (250Hz) of SS and CS cutting techniques were collected from 20 male college athletes. Normalised peak knee extension moment was larger in the SS technique than in the CS technique (0.40 +/- 0.10 in SS; 0.26 +/- 0.08 in CS). In the SS technique, the knee extensors (-0.10 +/- 0.06 in SS; -0.02 +/- 0.04 in CS) and ankle plantarflexors (-0.12 +/- 0.05 in SS; -0.07 +/- 0.03 in CS) did significantly more negative work (normalised). The direction change angle (40.5 +/- 8.7 degrees in SS; 33.0 +/- 6.8 degrees in CS) and the decrease in horizontal velocity of the centre of mass (-0.63 +/- 0.23 m/s in SS; -0.31 +/- 0.23 m/s in CS) were significantly larger in the SS technique. These results suggest that the SS technique is an effective means of changing running direction at the expense of velocity of the centre of mass and that the CS technique is better for minimising the reduction in horizontal velocity of the centre of mass.