Effects Of Different Toe Spring On Biomechanics Of Lower Limbs During Running

Objectives: In the design of professional running shoes,in order to make the foot can quickly pedal off the ground,designers tend to make the front end of the shoe more elastic,shoe head upturned hemispheric surface shape,such a structural design is to promote the foot bow,speed up the feet quickly off the ground,thus reducing the running process of heel pressure,Make the running process more natural.Therefore,this study uses kinematics and kinetic measurement tools to carry out experiments to compare and analyze the effects of different toe spring on the movement parameters of lower extremities,and to provide reference data for the structural design of professional running shoes.Methods: In this study,5 pairs of shoe heads were selected for 5°,10°,15°,20° and 30°.The effects of toe spring on kinematics and kinetic data of lower extremities during jogging were studied.In the course of the experiment,11 healthy male college students with stable gait were selected,and the subjects were jogging along the 8m runway at their own comfortable speed with the 1#,2#,3#,4# and 5# experimental shoes corresponding to the warping degree of the five pairs of shoes.At the beginning of each group of experiments,Vicon and Kistler are triggered synchronously,and kinematics and dynamics data are recorded synchronously.The kinematics data mainly recorded the change of flexural angle of hip,knee,ankle and metatarsal joint,and the dynamic data mainly recorded the direction of the Fx and the ground reaction force in the direction of Fz.Results: According to the results of this experiment,it is found that with the increase of toe spring,there is no significant difference in the time of support period,buffer period and pedal extension in a complete gait period.The difference of angle change of ankle joint in sagittal surface is mainly reflected in 3# experimental shoes and 5# experimental shoes.In a complete gait cycle,there was a significant difference in the angle change of the metatarsal toe joint in the sagittal surface.According to the statistical analysis of the experimental results,it was found that there were significant differences between 1# experimental shoes and 2# experimental shoes and 5# experimental shoes.The plantar flexor and dorsal flexor peaks of 1# experimental shoes and 2# experimental shoes were greater than the angle changes of 5# experimental shoes,and there were significant differences.In the dynamic results,there was no difference between the Fx peak and the valley value,but there was a significant difference in the load rate after the Fx peak.There was also a significant difference in the loading rate after the peak of Fz.Conclusion: Toe spring has an effect on the spatial parameters of running,in a certain degree of warping range,wearing toe spring running shoes will appear step by step to shorten the phenomenon of speed.At the same time,the toe spring has an effect on the angle change of the ankle and metatarsal joint in the sagittal surface,and with the increase of the toe spring,the flexural angle of the ankle joint increases gradually,but with the increase of the toe spring the flexural angle of the plantar toe joint is getting smaller.The toe spring has an effect on the parameters of the ground reaction force,and with the increase of the toe spring,the loading rate increases gradually after the peak,and the structure design of the toe spring helps the foot to pedal quickly off the ground.