The concurrent effects of strike pattern and ground-contact time on running economy
The concurrent effects of strike pattern and ground-contact time on running economy
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DOI：
10.1016/j.jsams.2013.05.012
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发表时间：
2014-07-01
影响因子：
4
通讯作者：
Merni, Franco
中科院分区：
文献类型：
--
作者：
Di Michele, Rocco;Merni, Franco
目的：跑步经济性是耐力表现的关键决定因素，了解影响跑步经济性的生物力学因素具有重要的理论和应用价值。本研究的目的是分析运动员的触地时间和击打方式如何同时影响跑步的经济性。设计：横断面。方法：14名亚优秀男子运动员在室外跑道上以14 km h（-1）的速度完成了6 min的亚极量跑试验，使用他们的习惯性击打方式（n = 7名后足罢工者：平均年龄，25.3岁（SD =2.4）;平均体重，64.7 kg（SD = 5.6）;平均身高，175.3 cm（SD = 5.2）; n= 7名中足罢工者：平均年龄，25.0岁（SD = 2.8）;平均体重，69.6 kg（SD = 4.0）;平均身高，180.1 cm（SD = 5.1）。在运行过程中，摄氧量和地面接触时间measured.Results：中足罢工者表现出显着较短（p = 0.015）的平均接触时间（0.228秒（SD = 0.009））相比，后脚罢工者（0.242秒（SD = 0.010））。相反，两组之间的平均摄氧量没有显著差异（p > 0.05）（中足撞击者：48.4 ml min（-1）kg（-1）（SD = 5.3）;后足撞击者：49.8 ml min（-1）kg（-1）（SD = 6.4））。线性模型分析表明，两组接触时间对跑步经济性的影响非常相似，接触时间延长1 ms，摄氧量降低约0.51 ml min（-1）kg（-1）。相比之下，当控制接触时间，中足罢工涉及约8.7毫升分钟（-1）公斤（-1）较低的氧摄取量相比，后脚striking.Conclusions：当调整的脚-地面接触的生物力学的跑步者的目的是最大限度地提高运行经济，中足罢工和长的接触时间之间的权衡必须追求。(C)2013年澳大利亚运动医学。由爱思唯尔有限公司出版。保留所有权利。
Objectives: Running economy is a key determinant of endurance performance, and understanding the biomechanical factors that affect it is of great theoretical and applied interest. This study aimed to analyse how the ground-contact time and strike pattern used by competitive runners concurrently affect running economy.Design: Cross-sectional.Methods: Fourteen sub-elite male competitive distance runners completed a 6-min submaximal running trial at 14 km h(-1) on an outdoor track using their habitual strike pattern (n = 7 rearfoot strikers: average age, 25.3 years old (SD =2.4); average weight, 64.7 kg (SD = 5.6); average height, 175.3 cm (SD = 5.2); n= 7 midfoot strikers: average age, 25.0 years old (SD = 2.8); average weight, 69.6 kg (SD = 4.0); average height, 180.1 cm (SD = 5.1). During the run, the oxygen uptake and ground-contact time were measured.Results: Midfoot strikers showed a significantly shorter (p = 0.015) mean contact time (0.228 s (SD = 0.009)) compared with rearfoot strikers (0.242 s (SD = 0.010)). Conversely, there was no significant difference (p > 0.05) between the groups with respect to mean oxygen uptake (midfoot strikers: 48.4 ml min(-1) kg(-1) (SD = 5.3); rearfoot strikers: 49.8 ml min(-1) kg(-1) (SD = 6.4)). Linear modelling analysis showed that the effect of contact time on running economy was very similar in the two groups, with a 1 ms longer contact time involving an approximately 0.51 ml min(-1) kg(-1) lower oxygen uptake. In contrast, when controlling for contact time, midfoot striking involved an approximately 8.7 ml min(-1) kg(-1) lower oxygen uptake compared with rearfoot striking.Conclusions: When adjusting the foot-ground contact biomechanics of a runner with the aim of maximising running economy, a trade-off between a midfoot strike and a long contact time must be pursued. (C) 2013 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.