Department of Kinesiology and Nutrition Sciences, University of Nevada, Las Vegas, Nevada.
J Strength Cond Res. 2018 Jul;32(7):1937-1947. doi: 10.1519/JSC.0000000000002093.
Harry, JR, Silvernail, JF, Mercer, JA, and Dufek, JS. Bilateral comparison of vertical jump landings and step-off landings from equal heights. J Strength Cond Res 32(7): 1937-1947, 2018-The purpose of this investigation was to examine kinetic, kinematic, and temporal parameters during vertical jump landings (VJL) and step-off landings (STL) from equal heights. Five men (25.0 ± 1.6 years; 1.7 ± 0.4 m; 79.7 ± 7.1 kg) and 5 women (20.8 ± 1.6 years; 1.6 ± 0.4 m; 68.5 ± 7.1 kg) performed 15 VJL and 15 STL. Paired-samples t-tests (α = 0.05) compared impact velocity and the times to the first (F1) and second (F2) peak vertical ground reaction force magnitudes (tF1 and tF2) and the end of impact. Two-way analyses of variance (α = 0.05) compared limb and task differences in F1, F2, hip, knee, and ankle joint angles at ground contact, F1, F2, and the end of impact, and hip, knee, and ankle joint displacements between contact and F1, F1 and F2, and F2 and the end of impact. Impact velocity was not different between STL and VJL, although STL produced a greater F1 and a more rapid tF2. Greater hip, knee, and ankle flexion/dorsiflexion occurred during STL throughout the majority of impact regardless of limb. Lesser hip, knee, and ankle joint displacements occurred during STL regardless of limb between F1 and F2, whereas greater joint displacement occurred between F2 and the end of impact. Lastly, knee joint angles at ground contact differed between limbs during STL only. Strength and conditioning professionals aiming to improve an athlete's performance during sport-specific jump landings should consider the likely impact attenuation outcomes before selecting STL or VJL in training.
哈里、JR、西尔弗奈尔、JF、默瑟、JA 和杜费克，JS。从相同高度的垂直跳跃着陆和台阶式着陆的双侧比较。J 力量与调节研究 32(7):1937-1947，2018-本研究的目的是检查等高度的垂直跳跃着陆(VJL)和台阶式着陆(STL)期间的动力学、运动学和时间参数。5 名男性(25.0±1.6 岁;1.7±0.4 m;79.7±7.1 kg)和 5 名女性(20.8±1.6 岁;1.6±0.4 m;68.5±7.1 kg)进行了 15 次 VJL 和 15 次 STL。配对样本 t 检验(α=0.05)比较了冲击速度和第一次(F1)和第二次(F2)垂直地面反作用力峰值的时间(tF1 和 tF2)以及冲击结束时的时间。两因素方差分析(α=0.05)比较了肢体和任务差异在 F1、F2、髋关节、膝关节和踝关节在地面接触时的角度、F1、F2 和冲击结束时的角度以及髋关节、膝关节和踝关节在接触时和 F1、F1 和 F2 以及 F2 和冲击结束时的位移。STL 和 VJL 之间的冲击速度没有差异，尽管 STL 产生了更大的 F1 和更快的 tF2。无论肢体如何，STL 在冲击的大部分时间内都产生了更大的髋关节、膝关节和踝关节的弯曲/背屈。无论肢体如何，STL 在 F1 和 F2 之间的关节位移较小，而在 F2 和冲击结束之间的关节位移较大。最后，仅在 STL 期间，在地面接触时，膝关节角度在肢体之间有所不同。旨在提高运动员在特定运动跳跃着陆时表现的力量和调节专业人员在训练中选择 STL 或 VJL 之前，应考虑可能的冲击衰减结果。
