Chang Eunwook, Norcross Marc F, Johnson Sam T, Kitagawa Taichi, Hoffman Mark
1School of Biological and Population Health Sciences, College of Public Health and Human Sciences, Oregon State University, Corvallis, Oregon; and 2Sports Medicine, Department of Athletics, University of San Francisco, San Francisco, California.
J Strength Cond Res. 2015 Feb;29(2):545-51. doi: 10.1519/JSC.0000000000000652.
The purpose of this study was to examine the relationships between maximum vertical jump height and (a) rate of torque development (RTD) calculated during 2 time intervals, 0-50 milliseconds (RTD50) and 0-200 milliseconds (RTD200) after torque onset and (b) peak torque (PT) for each of the triple extensor muscle groups. Thirty recreationally active individuals performed maximal isometric voluntary contractions (MVIC) of the hip, knee and ankle extensors, and a countermovement vertical jump. Rate of torque development was calculated from 0 to 50 (RTD50) and 0 to 200 (RTD200) milliseconds after the onset of joint torque. Peak torque was identified and defined as the maximum torque value during each MVIC trial. Greater vertical jump height was associated with greater knee and ankle extension RTD50, RTD200, and PT (p ≤ 0.05). However, hip extension RTD50, RTD200, and PT were not significantly related to maximal vertical jump height (p > 0.05). The results indicate that 47.6 and 32.5% of the variability in vertical jump height was explained by knee and ankle extensor RTD50, respectively. Knee and ankle extensor RTD50 also seemed to be more closely related to vertical jump performance than RTD200 (knee extensor: 28.1% and ankle extensor: 28.1%) and PT (knee extensor: 31.4% and ankle extensor: 13.7%). Overall, these results suggest that training specifically targeted to improve knee and ankle extension RTD, especially during the early phases of muscle contraction, may be effective for increasing maximal vertical jump performance.
(a) 在扭矩产生后0至50毫秒（RTD50）和0至200毫秒（RTD200）这两个时间间隔内计算得出的扭矩发展速率（RTD），以及(b) 每组伸膝肌群的峰值扭矩（PT）。30名有运动习惯的个体进行了髋、膝和踝伸肌的最大等长自主收缩（MVIC）以及一次反向纵跳。扭矩发展速率是从关节扭矩产生后0至50（RTD50）和0至200（RTD200）毫秒进行计算的。确定并将峰值扭矩定义为每次MVIC试验期间的最大扭矩值。更大的垂直跳高度与更大的膝和踝伸展RTD50、RTD200和PT相关（p≤0.05）。然而，髋伸展RTD50、RTD200和PT与最大垂直跳高度无显著相关性（p>0.05）。结果表明，垂直跳高度变化的47.6%和32.5%分别由膝和踝伸肌RTD50所解释。膝和踝伸肌RTD50似乎也比RTD200（膝伸肌：28.1%，踝伸肌：28.1%）和PT（膝伸肌：31.4%，踝伸肌：13.7%）与垂直跳表现的关系更为密切。总体而言，这些结果表明，专门针对提高膝和踝伸展RTD进行训练，尤其是在肌肉收缩的早期阶段，可能对提高最大垂直跳表现有效。
