The Research On The High-heel Sole Optimization Effect During Normal Gait

The danger women wearing high-heeled shoes is obvious, but women's enthusiasm for high-heeled shoes are unfailing .High-heeled shoes design itself had violated the principle of human engineering, it's energy return on the soles achieved through structural damping looked very reluctantly. This study attempts to change the material of high-heeled shoe sole, that is exogenous means to explore the high-heeled shoes biomechanics of material damping studies.This research firstly analyzed the biomechanical properties changes of three different height shoes which join EVA mat before and after on the "foot-shoe interface" and "shoe-ground interface", due to joining the EVA mat in high-heeled shoes influnced insoles far greater than the outsoles, so it impacts "foot-shoe interface" is much larger than the "shoe-ground interface." The "foot - shoe interface" research shows: The adding of EVA materials can effectively buffer energy absorbing of foot and protect the three important points on foot: the calcaneus, the second metatarsal and the fifth metatarsal. To a certain extent, this exogenous biomechanical means can reduce the foot injury. Based on that, In-depth study aimed to compare the improved results that the same thickness of different materials, the same material with different thickness of EVA materials which add to the medial forefoot area in 8.5cm-high heeled shoes. Sole material as an important indicator, it's change has significantly affected the biomechanical properties; however, the thickness of the material has little effect on the biomechanical properties. The reasonably hardness of EVA can increase the foot contact area , re-distribute the plantar pressure to prolong action time, avoid the occur of high-pressure region, prevent the premature produce of fatigue, maintain the normal function of the human foot. Under the same force, soft soles is superior to rigid soles to protect foot, and this can better explains the easy deformation of soft soles, with excellent energy return properties.The proposed design of high-heeled shoes soles to consider the use of elastic potential energy of the time effect, frequency effect and position effect, high-heeled shoes manufacturers only to distinguish between the foot size of the shoes, did not pay attention to the relationship among sole thickness, body weight and body height. while the establishment of a complete set of high-heeled shoes comfort evaluation system for the high-heeled shoes can also provide a reference basis for scientific design.