Kinetic and kinematic characteristics of sprint running with a weighted vest
Kinetic and kinematic characteristics of sprint running with a weighted vest
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负重背心冲刺跑的动力学和运动学特性
DOI：
10.1016/j.jbiomech.2021.110655
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发表时间：
2021
影响因子：
2.4
通讯作者：
Nagahara Ryu
中科院分区：
文献类型：
--
作者：
Gleadhill Sam;Yuki Nobumitsu;Wada Tomohito;Nagahara Ryu
本研究阐明了控制和负重背心短跑与7%的身体质量的负荷之间的动力学和运动学的变化。14名男子短跑运动员完成了60米控制和背心短跑在一个长的力量平台系统。将每一步的地面反作用力和时空变量分组，分别代表每次试验的初始加速（第1 - 4步）、中间加速（第5 - 14步）、后期加速（第15步-最大速度达到前一步）和最大速度（最大速度达到时的步幅）阶段。采用事后Tukey HSD和Cohen's d效应量（95%置信区间）的双因素ANOVA阐明了试验和阶段之间的差异。在对照组和背心试验组之间，通过微小步长（1.95-2.72%）和频率（0.87-1.54%）降低速度（3.41-3.78%）。垂直冲量增加（6.46-6.78%），通过适度的支持时间增加（4.84-6.00%），加上没有有效的垂直平均力的差异，在背心试验，与对照组相比。试验和阶段之间没有显著的相互作用。因此，尽管负重背心试验没有增加垂直平均力的产生，但背心在支撑阶段逐步增加垂直力的施加时间，同时支撑更大的总负荷（体重加背心质量）。
This study elucidated kinetic and kinematic changes between control and weighted vest sprinting with a load of 7% body mass. Fourteen male sprinters completed 60 m control and vest sprints over a long force platform system. Step-to-step ground reaction force and spatiotemporal variables were grouped, representing the initial acceleration (1st–4thsteps), middle acceleration (5th–14thsteps), later acceleration (15thstep–step before maximum velocity reached) and maximum velocity (stride where maximum velocity reached) phase during each trial. Two-way ANOVA with post hoc Tukey HSD and a Cohen’s d effect size with 95% confidence intervals elucidated the difference between trials and phases. Between control and vest trials the velocity decreased (3.41–3.78%) through trivial–small step length (1.95–2.72%) and frequency (0.87–1.54%) decreases. Vertical impulse increased (6.46–6.78%) through moderate support time increases (4.84–6.00%), coupled with no effective vertical mean force differences during the vest trial, compared to the control. There was no significant interaction between trials and phases. Therefore, although weighted vest trials did not increase vertical mean force production, vests did induce an increased vertical force application duration during the support phase step-to-step while supporting a larger total load (body mass plus vest mass).