Clarke T E, Frederick E C, Cooper L B
Int J Sports Med. 1983 Nov;4(4):247-51. doi: 10.1055/s-2008-1026043.
To determine the effects of widely varying amounts of cushioning upon vertical force (VF) parameters, ten male subjects, (mean weight = 68.0 kg) ran at a speed of 4.5 m . s-1 (6 min/mile pace) and contacted a Kistler force platform. Two shoes were tested: a hard one and a softer shoe that had 50% more cushioning as measured by an instrumented impact tester. Five right footfalls were collected for each shoe on each subject during which the ground reaction forces were sampled at 500 HZ using a PDP 11/34 minicomputer. Eight parameters from the VF data obtained for each trial were selected for analysis and compared statistically using a paired difference t test. It was found [force magnitudes expressed in multiples of body weight (BW)] that the time to the vertical force impact peak (VFIP) was significantly longer (hard = 22.5 ms, soft = 26.6 ms) in the soft shoe; however, no differences were seen in the magnitudes (hard = 2.30 BW, soft = 2.34 BW). The minimum after the VFIP was also significantly delayed in the soft shoe (hard = 33.8 ms, soft = 37.9 ms) and was significantly greater in the soft shoe (hard = 1.46 BW, soft = 1.90 BW). The peak VF propulsive force occurred statistically at the same time in both shoes (hard = 85.7 ms, soft = 84.0 ms), but was significantly greater in the soft shoe (hard = 2.73 BW, soft = 2.83 BW).(ABSTRACT TRUNCATED AT 250 WORDS)
为了确定大量不同程度的缓冲对垂直力（VF）参数的影响，十名男性受试者（平均体重 = 68.0千克）以4.5米·秒-1的速度（6分钟/英里配速）跑步，并接触一个奇石乐测力台。测试了两双鞋：一双硬鞋和一双软鞋，通过仪器化冲击测试仪测量，软鞋的缓冲比硬鞋多50%。在每个受试者身上，每双鞋收集五次右脚落地情况，在此期间，使用PDP 11/34小型计算机以500赫兹的频率对地面反作用力进行采样。从每次试验获得的VF数据中选择八个参数进行分析，并使用配对差异t检验进行统计学比较。结果发现[力的大小以体重（BW）的倍数表示]，软鞋中垂直力冲击峰值（VFIP）出现的时间明显更长（硬鞋 = 22.5毫秒，软鞋 = 26.6毫秒）；然而，力的大小没有差异（硬鞋 = 2.30 BW，软鞋 = 2.34 BW）。软鞋中VFIP之后的最小值也明显延迟（硬鞋 = 33.8毫秒，软鞋 = 37.9毫秒），并且软鞋中的最小值明显更大（硬鞋 = 1.46 BW，软鞋 = 1.90 BW）。两双鞋中VF推进力峰值在统计学上出现的时间相同（硬鞋 = 85.7毫秒，软鞋 = 84.0毫秒），但软鞋中的峰值明显更大（硬鞋 = 2.73 BW，软鞋 = 2.83 BW）。（摘要截取自250字）
