Impacts and kinematic adjustments during an exhaustive run
Impacts and kinematic adjustments during an exhaustive run
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DOI：
10.1097/00005768-200206000-00015
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发表时间：
2002-06-01
期刊：
影响因子：
--
通讯作者：
McLean, SP
中科院分区：
文献类型：
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作者：
Derrick, TR;Dereu, D;McLean, SP
德里克R.，D. DEREU和S. P.姆克林。在一次极限运行中的冲击和运动学调整。医学科学体育锻炼：第34卷，第6号。pp. 998-1002，2002。目的：研究跑者在一次极限跑中所做的运动学调整，并观察这些调整对冲击和冲击衰减的影响。研究方法：10名休闲跑步者在跑步机上以等于他们最大努力时平均3200米跑步速度的速度（平均时间：15.7 +/- 1.7分钟）跑到意志耗尽。头部和腿部加速度计，膝盖电测角计，和后脚电测角计连接到每个主题。在运行开始、中间和结束时以1000 Hz对数据进行采样。结果：足跟撞击时膝关节屈曲度明显增加（起始：164.9 ± 2.3 °，终止：160.5 ± 2.9 °; P < 0.05）。后足角度在冲击时变得更加内翻（开始：12.2 ± 1.6度：结束：13.6 ± 1.9度P < 0.05）。这些运动学变化导致下肢在撞击期间具有较低的有效质量。这种有效质量的减少使腿更容易加速：因此，峰值腿冲击加速度（开始：6.11 +/- 0.96 g：结束：7.38 +/- 1.05 g：P < 0.05）和冲击衰减（开始：74.5 +/- 5.4%;结束：77.5 +/- 4.1%：P < 0.05）在运行过程中增加。结论：由于有效质量降低，腿部峰值冲击加速度的增加不被认为是受伤风险的增加。运动学的改变可能导致在力竭跑的后期阶段代谢成本增加。
DERRICK, T. R., D. DEREU, and S. P. MCLEAN. Impacts and kinematic adjustments during an exhaustive run. Med. Sci. Sports Exerc., Vol. 34, No. 6. pp. 998-1002, 2002. Purpose: To examine the kinematic adjustments that runners make during an exhaustive run and to look at the effects these adjustments have on shock and shock attenuation. Methods: Ten recreational runners ran to volitional exhaustion on a treadmill at a velocity equal to their average 3200-m running velocity at maximal effort (average time: 15.7 +/- 1.7 min). Head and leg accelerometers, a knee electrogoniometer, and a rearfoot electrogoniometer were attached to each subject. The data were sampled at 1000 Hz at the start, middle, and end of the run. Results: The knee became significantly more flexed at heel impact (start: 164.9 +/- 2.3degrees end: 160.5 +/- 2.9degrees; P < 0.05). The rearfoot angle became more inverted at impact (start: 12.2 +/- 1.6degrees: end: 13.6 +/- 1.9degrees P < 0.05). These kinematic changes resulted in a lower extremity that that had a lower effective mass during the impact. This decreased effective mass allowed the leg to accelerate more easily: thus, peak leg impact accelerations (start: 6.11 +/- 0.96 g: end: 7.38 +/- 1.05 g: P < 0.05) and impact attenuation (start: 74.5 +/- 5.4%; end: 77.5 +/- 4.1%: P < 0.05) increased during the progression of the run. Conclusions: The increase in peak impact accelerations at the leg was not considered an increased injury risk because of the decreased effective mass. The altered kinematics may have resulted in increased metabolic costs during the latter stages of the exhaustive run.