Development of a standardized test method for characterizing the stiffness of heel sole segments of sports shoes

Individual suspension of different segments of the heel sole is imperative for optimal 3D cushioning and rear foot control. A test rig was developed which measures the overall structural properties of the heel sole as well as the properties of the medial, lateral, and posterior segments. The structural properties measured are the stiffness as a function of deflection and the influence of viscosity from compression tests of the segments and whole heel. Based on the properties a critique was made of the shoes’ supinating effect. This effect is required to counterbalance overpronation in shod running. The level of energy absorption was also assessed. The test method developed does not rely on test persons and is thus more objective than other tests for determining the supinating effect of the shoes.