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首页> 外文期刊>Biology of sport >DIFFERENCES IN GROUND CONTACT TIME EXPLAIN THE LESS EFFICIENT RUNNING ECONOMY IN NORTH AFRICAN RUNNERS
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DIFFERENCES IN GROUND CONTACT TIME EXPLAIN THE LESS EFFICIENT RUNNING ECONOMY IN NORTH AFRICAN RUNNERS

机译：地面接触时间的差异解释了北非跑者缺乏有效的奔跑经济

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The purpose of this study was to investigate the relationship between biomechanical variables and running economy in North African and European runners. Eight North African and 13 European male runners of the same athletic level ran 4-minute stages on a treadmill at varying set velocities. During the test, biomechanical variables such as ground contact time, swing time, stride length, stride frequency, stride angle and the different sub-phases of ground contact were recorded using an optical measurement system. Additionally, oxygen uptake was measured to calculate running economy. The European runners were more economical than the North African runners at 19.5 km ? h~(-1) presented lower ground contact time at 18 kmh~(-1) and 19.5 kmh~(-1) and experienced later propulsion sub-phase at 10.5 km-h"1, 12 km-h~(-1), 15 kmh~(-1), 16.5 kmh~(-1) and 19.5 km-h"1 than the European runners (P<0.05). Running economy at 19.5 km ? h~(-1) was negatively correlated with swing time (r=-0.53) and stride angle (r=-0.52), whereas it was positively correlated with ground contact time (r=0.53). Within the constraints of extrapolating these findings, the less efficient running economy in North African runners may imply that their outstanding performance at international athletic events appears not to be linked to running efficiency. Further, the differences in metabolic demand seem to be associated with differing biomechanical characteristics during ground contact, including longer contact times.
机译：这项研究的目的是调查北非和欧洲跑步者的生物力学变量与经济运行之间的关系。八名具有相同运动水平的北非和13名欧洲男运动员在跑步机上以不同的设定速度跑了4分钟。在测试过程中，使用光学测量系统记录了生物力学变量，例如地面接触时间，摆动时间，步幅长度，步幅频率，步幅角和地面接触的不同子阶段。另外，测量摄氧量以计算运行经济性。在19.5公里处，欧洲选手比北非选手更经济吗？ h〜（-1）在18 kmh〜（-1）和19.5 kmh〜（-1）处具有较低的地面接触时间，在10.5 km-h“ 1、12 km-h〜（-1 ），15 kmh〜（-1），16.5 kmh〜（-1）和19.5 km-h“ 1比欧洲选手（P <0.05）。在19.5公里处运行经济？ h〜（-1）与摆动时间（r = -0.53）和步幅角（r = -0.52）呈负相关，而与地面接触时间（r = 0.53）呈正相关。在推断这些发现的限制内，北非跑步者的低效率跑步经济可能意味着他们在国际运动项目中的出色表现似乎与跑步效率无关。此外，代谢需求的差异似乎与地面接触期间的不同生物力学特性有关，包括更长的接触时间。

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