Eccentric loading and range of knee joint motion effects on performance enhancement in vertical jumping
Eccentric loading and range of knee joint motion effects on performance enhancement in vertical jumping
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DOI：
10.1016/j.humov.2007.05.001
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发表时间：
2007-12-01
影响因子：
2.1
通讯作者：
Wallace, Eric S.
中科院分区：
文献类型：
--
作者：
Moran, Kieran A.;Wallace, Eric S.
本研究的目的是确定偏心负荷和膝关节活动范围的变化对垂直跳跃中与拉伸缩短周期相关的性能增强的影响。以17名优秀男子排球运动员为研究对象，分别进行了蹲跳（SJ）、反跳（CMJ）和30 cm跳（DJ 30）三种不同的纵跳动作。膝关节角度（70度和90度屈曲）在每一个跳跃类型的推进阶段的开始进行实验控制，与躯干保持尽可能直立。力和运动数据被记录为每个性能，并用于计算一系列的运动学和动力学变量，包括髋关节，膝关节和踝关节的角度，角速度，所做的工作，净关节力矩和一些时间变量。每个参与者的12次试验的平均值用于一系列重复测量ANOVA（跳跃x膝关节，α = 0.05）。从两个膝关节角度来看，偏心负荷的增加导致跳跃高度的显著增加（DJ 30> CMJ > SJ; p <0.05）。膝关节屈曲70度时的这些增强显著大于屈曲90度时的增强（p <0.05）。从膝关节屈曲70度开始，这些增强是由于所有三个关节所做的工作显著增加;而从膝关节屈曲90度开始，只有髋关节和踝关节似乎有所贡献（p <0.05）。在跳跃中使用SSC相关的增强量取决于偏心负荷的大小和所使用的运动范围的相互作用。(c)2007 Elsevier B. V.保留所有权利。
The aim of the study was to determine the effects of variations in eccentric loading and knee joint range of motion on performance enhancement associated with the stretch-shortening cycle in vertical jumping. Seventeen male elite volleyball players performed three variations of the vertical jump which served as the research model: the squat jump (SJ), countermovement jump (CMJ) and drop jump from a height of 30 cm (DJ30). Knee joint angle (70 degrees and 90 degrees of flexion) at the commencement of the propulsive phase for each jump type was experimentally controlled, with the trunk kept as erect as possible. Force and motion data were recorded for each performance and used to compute a range of kinematic and kinetic variables, including hip, knee and ankle angles, angular velocities, work done, net joint moments and a number of temporal variables. The average of 12 trials for each participant was used in a series of repeated measures ANOVA's (jump x knee, alpha = .05). From both knee joint angles, an increase in eccentric loading resulted in a significant increase in jump height (DJ30 > CMJ > SJ; p < .05). These enhancements were significantly greater (p < .05) for 70 degrees in comparison to 90 degrees of knee flexion. From 70 degrees of knee flexion, these enhancements were due to significant increases in work done at all three joints; while from 90 degrees of knee flexion, only the hip and ankle joints appeared to contribute (p < .05). The amount of enhancement associated with employing the SSC in jumping is dependent upon the interaction of the magnitude of eccentric loading and the range of motion used. (c) 2007 Elsevier B.V. All rights reserved.