Energetics and mechanics of human running on surfaces of different stiffnesses
Energetics and mechanics of human running on surfaces of different stiffnesses
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DOI：
10.1152/japplphysiol.01164.2000
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发表时间：
2002-02-01
影响因子：
3.3
通讯作者：
Herr, HM
中科院分区：
文献类型：
--
作者：
Kerdok, AE;Biewener, AA;Herr, HM
哺乳动物使用腿部的弹性成分（主要是肌腱、韧带和肌肉）来经济地奔跑，同时在各种表面上保持一致的支撑力学。为了研究腿部刚度和代谢成本如何受到基底刚度变化的影响，我们构建了具有可调节刚度的实验平台，以适应力板安装的跑步机。8名男性受试者[平均体重：74.4 +/- 7.1（SD）kg;腿长：0.96 +/- 0.05 m]在5种不同表面硬度（75.4、97.5、216.8、454.2和945.7 kN/m）下以3.7 m/s的速度跑步。收集代谢、地面反作用力和运动学数据。表面硬度降低了12.5倍，导致跑步者的代谢率降低了12%，腿部硬度增加了29%。跑步者的支撑机制基本保持不变。这些结果表明，表面刚度影响运行的经济性，而不影响运行支持力学。我们假设，所研究的柔性表面的能量反弹增加有助于提高运行经济性。
Mammals use the elastic components in their legs (principally tendons, ligaments, and muscles) to run economically, while maintaining consistent support mechanics across various surfaces. To examine how leg stiffness and metabolic cost are affected by changes in substrate stiffness, we built experimental platforms with adjustable stiffness to fit on a force-plate-fitted treadmill. Eight male subjects [mean body mass: 74.4 +/- 7.1 (SD) kg; leg length: 0.96 +/- 0.05 m] ran at 3.7 m/s over five different surface stiffnesses (75.4, 97.5, 216.8, 454.2, and 945.7 kN/m). Metabolic, ground-reaction force, and kinematic data were collected. The 12.5-fold decrease in surface stiffness resulted in a 12% decrease in the runner's metabolic rate and a 29% increase in their leg stiffness. The runner's support mechanics remained essentially unchanged. These results indicate that surface stiffness affects running economy without affecting running support mechanics. We postulate that an increased energy rebound from the compliant surfaces studied contributes to the enhanced running economy.