Johnson G R
Department of Mechanical Engineering, University of Newcastle upon Tyne, United Kingdom.
Prosthet Orthot Int. 1988 Aug;12(2):91-5. doi: 10.3109/03093648809078205.
This paper describes a study of the effectiveness of commercially available shock absorbing insoles when used in four different pairs of shoes during normal walking. The measurement method was based on the use of the Fourier Transform of the axial acceleration of the leg measured by an accelerometer mounted at the ankle. The magnitude of shock was measured by the "Shock Factor" which has been defined as the rms acceleration between 50 Hz and 150 Hz expressed as a proportion of that between 10 Hz and 150 Hz. Nine insoles were tested in each pair of shoes and the Shock factor for each combination was compared with the value obtained for the shoes alone. Statistically significant reductions of Shock Factor were noted in 58% of cases; the largest improvement (30% reduction in Shock Factor) was achieved by lightweight Sorbothane. The experimental technique has now been further developed to allow the measurement of Shock Factor by a portable Shock Meter.
本文描述了一项关于市售减震鞋垫在正常行走过程中用于四双不同鞋子时的有效性的研究。测量方法基于对安装在脚踝处的加速度计所测量的腿部轴向加速度进行傅里叶变换。冲击的大小通过“冲击因子”来测量，该因子被定义为50赫兹至150赫兹之间的均方根加速度与10赫兹至150赫兹之间的均方根加速度的比例。在每双鞋子中测试了九种鞋垫，并将每种组合的冲击因子与仅穿鞋子时获得的值进行比较。在58%的案例中观察到冲击因子有统计学上的显著降低；最大的改善（冲击因子降低30%）是由轻质的索博泰因材料实现的。现在，实验技术已进一步发展，可以通过便携式冲击计来测量冲击因子。
