Effect of viscoelastic shoe insoles on vertical impact forces in heel-toe running

Abstract

The purposes of this study were: 1) to compare the impact forces in running using running shoes with con ventional insoles to the impact forces using running shoes with four different viscoelastic insoles, 2) to discuss possible effects of the viscoelastic insoles on lower leg kinematics, and 3) to explain the force and kinematic results using a mechanical model. Kinetic and kinematic data were collected for 14 subjects running heel-toe at an average speed of 4 m/s. The results showed that the four tested viscoelastic insoles did not differ in variables describing the vertical impact forces (vertical force peak, time of occurrence of vertical force peak, maximum vertical loading rate) compared to the conventional insoles furnished in running shoes. Fur thermore, the viscoelastic insoles did not influence ki nematic variables of the lower extremities in a system atic way.