Paquette Max R, Melcher Daniel A
1 University of Memphis.
2 McConnell Heart Health Center.
J Appl Biomech. 2017 Jul;33(3):216-221. doi: 10.1123/jab.2016-0170. Epub 2017 Jun 26.
The purposes of this study were to compare selected biomechanical variables before and after a long run, and to assess the relationship between weekly running volume and changes in lower limb biomechanics after the run. Twelve trained habitual rearfoot strike male runners ran overground before and after a treadmill long run while kinematic and kinetic data were recorded. Repeated measures analysis of variance and Cohen's d effect sizes were used to compare kinematic and kinetic variables before and after the run. Loading rate was 6% higher after the run (p < .05) but this difference had a small effect size (d = .32). Moderate effects were found for a 25% increase in peak ankle eversion (d = 0.62) and a 10% increase in hip adduction (d = 0.60) after the run. These findings suggest that the completion of a submaximal long run does not yield potentially injurious lower limb biomechanics in uninjured rearfoot strike runners. Weekly running mileage was not correlated to biomechanical changes observed before and after the long run. Since biomechanical responses to the long run varied among runners, differences in other factors such as specific training regimens and neuromuscular control should be considered in future studies.
本研究的目的是比较长跑前后选定的生物力学变量，并评估每周跑步量与长跑后下肢生物力学变化之间的关系。12名训练有素的习惯性后足着地男性跑步者在跑步机长跑前后在地面上跑步，同时记录运动学和动力学数据。采用重复测量方差分析和科恩d效应量来比较跑步前后的运动学和动力学变量。跑步后负荷率提高了6%（p < 0.05），但这种差异的效应量较小（d = 0.32）。跑步后发现踝关节外翻峰值增加25%（d = 0.62）和髋关节内收增加10%（d = 0.60）有中等效应。这些发现表明，在未受伤的后足着地跑步者中，完成次最大强度的长跑不会产生可能导致受伤的下肢生物力学变化。每周跑步里程与长跑前后观察到的生物力学变化无关。由于跑步者对长跑的生物力学反应各不相同，未来的研究应考虑其他因素的差异，如特定的训练方案和神经肌肉控制。
