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首页> 外文期刊>The Journal of Experimental Biology >Effects of stride frequency and foot position at landing on braking force, hip torque, impact peak force and the metabolic cost of running in humans
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Effects of stride frequency and foot position at landing on braking force, hip torque, impact peak force and the metabolic cost of running in humans

机译：着陆时的步幅频率和脚位置对制动力，髋部扭矩，冲击峰值力和人体跑步的代谢成本的影响

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Endurance runners are often advised to use 90 strides min(-1), but how optimal is this stride frequency and why? Endurance runners are also often advised to maintain short strides and avoid landing with the feet too far in front of their hips or knees (colloquially termed 'overstriding'), but how do different kinematic strategies for varying stride length at the same stride frequency affect economy and impact peaks? Linear mixed models were used to analyze repeated measures of stride frequency, the anteroposterior position of the foot at landing, V-O2, lower extremity kinematics and vertical ground reaction forces in 14 runners who varied substantially in height and body mass and who were asked to run at 75, 80, 85, 90 and 95 strides min(-1) at 3.0 m s(-1). For every increase of 5 strides min-1, maximum hip flexor moments in the sagittal plane increased by 5.8% (P 0.0001), and the position of the foot at landing relative to the hip decreased by 5.9% (P=0.003). Higher magnitudes of posteriorly directed braking forces were associated with increases in foot landing position relative to the hip (P=0.0005) but not the knee (P=0.54); increases in foot landing position relative to the knee were associated with higher magnitudes (P 0.0001) and rates of loading (P=0.07) of the vertical ground reaction force impact peak. Finally, the mean metabolically optimal stride frequency was 84.8 +/- 3.6 strides min(-1), with 50.4% of the variance explained by the trade-off between minimizing braking forces versus maximum hip flexor moments during swing. The results suggest that runners may benefit from a stride frequency of approximately 85 strides min-1 and by landing at the end of swing phase with a relatively vertical tibia.
机译：通常建议耐力跑步者使用90步的min（-1），但此步的频率如何最佳？为什么？还经常建议耐力跑步者保持短距离的步伐，并避免双脚落在臀部或膝盖的前面（俗称“超步”），但是在相同的步幅频率下改变步幅长度的不同运动策略如何影响经济性和影响高峰？使用线性混合模型分析了14个跑步者的步幅频率，着陆时脚的前后位置，V-O2，下肢运动学和垂直地面反作用力的重复测量，这些跑步者的身高和体重有很大不同，并且被要求在3.0 ms（-1）下以75、80、85、90和95的步幅min（-1）运行。每增加5个步长min-1，矢状面的最大髋屈肌力矩增加5.8％（P <0.0001），着陆时脚相对于髋部的位置下降5.9％（P = 0.003）。后向制动力的量级较高与脚相对于臀部的着陆位置的增加有关（P = 0.0005），而不与膝盖有关（P = 0.54）。相对于膝盖的脚着地位置的增加与更高的幅度（P <0.0001）和垂直地面反作用力冲击峰值的负荷率（P = 0.07）有关。最后，平均代谢最佳步幅为84.8 +/- 3.6步幅min（-1），其中50.4％的方差由挥杆过程中最小化制动力与最大髋屈肌力矩之间的权衡来解释。结果表明，跑步者可能会受益于大约85个步幅min-1的步幅频率，并通过在挥杆阶段结束时以相对垂直的胫骨着陆而受益。

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