Differences in Spring-Mass Characteristics Between One- and Two-Legged Hopping
Differences in Spring-Mass Characteristics Between One- and Two-Legged Hopping
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DOI：
10.1123/jab.29.6.785
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发表时间：
2013-12-01
影响因子：
1.4
通讯作者：
Ogata, Toru
中科院分区：
文献类型：
--
作者：
Hobara, Hiroaki;Kobayashi, Yoshiyuki;Ogata, Toru
虽然许多体育活动和运动测量训练方法涉及单侧和双侧运动，但对单腿跳跃（OLH）和双腿跳跃（TLH）过程中腿部僵硬（K腿）的差异知之甚少。本研究的目的是调查跳频对OLH和TLH期间K腿差异的影响。使用弹簧-质量模型和在2.0、2.5和3.0 Hz频率下OLH和TLH期间从17名参与者收集的数据，将K腿计算为最大地面反作用力（F-峰值）与从垂直地面反作用力测量的站立阶段中间的最大质心位移（Delta COM）的比值。在所有频率下，发现TLH期间的K腿和F峰均显著大于OLH，但未发现跳跃类型对Delta COM有显著影响。这些结果表明，在给定的跳频下，OLH和TLH之间的K腿是不同的，并且OLH和TLH期间的K腿的差异主要与F峰的差异而不是Δ COM相关。
Although many athletic activities and plyometric training methods involve both unilateral and bilateral movement, little is known about differences in the leg stiffness (K-leg) experienced during one-legged hopping (OLH) and two-legged hopping (TLH) in place. The purpose of this study was to investigate the effect of hopping frequencies on differences in K-leg during OLH and TLH. Using a spring-mass model and data collected from 17 participants during OLH and TLH at frequencies of 2.0, 2.5, and 3.0 Hz, K-leg was calculated as the ratio of maximal ground reaction force (F-peak) to the maximum center of mass displacement (Delta COM) at the middle of the stance phase measured from vertical ground reaction force. Both K-leg and F-peak were found to be significantly greater during TLH than OLH at all frequencies, but type of hopping was not found to have a significant effect on Delta COM. These results suggest that K-leg is different between OLH and TLH at a given hopping frequency and differences in K-leg during OLH and TLH are mainly associated with differences in F-peak but not Delta COM.