Research On The Damping And Stability Of The Heel Of Different Midsole Bubble EVA Comprehensive Training Shoes

In sports,when the human body comes into contact with the ground,it will be subjected to the impact of the ground,and the accumulation of impact force will cause sports injury.The cushioning of the shoe can reduce the impact force for the human body,there by preventing or reducing the probability of injury.Changes of the ankle joint and knee mechanics during in exercise may be a factor in lower limb injury.The stability of the shoe can reduce the range of motion of the ankle joint.We need shoes to provide cushioning and stability in motion.Midsole bubble foam filling technology creates better cushioning during exercise.However,the internal gas has a certain fluidity and thickness,which will affect the heel stability.A steady decrease in heel increases the chance of motion damage.In order to improve the quality of comprehensive training shoes in China,provide better equipment for sports people,and provide research ideas and references for the manufacture and development of sports shoes in China,this study has adopted three different midsoles bubble foam EVA from 15 male subjects.The differences between the dynamics and kinematics of the lower limbs of the comprehensive training shoes and the existing EVA comprehensive training shoes,the difference of the mechanical indexes of the heel materials are used to study the results.Purposes: To study the cushioning and stability of three different midsoles EVA comprehensive training shoes,and compare with the existing EVA comprehensive training shoes.Provide manufacturing reference for footwear manufacturers.Methods: Number of four test shoes:A: large mid-bubble foam,B: medium bubble foam,C:solid bubble foam,D:existing EVA comprehensive training shoes.tow test methods: Biomechanical test,Impact test.Biomechanical testing uses the Vicon motion capture system and the Kistler force table.Heel cushioning and stability were studied by 15 male subjects wearing three different midsole bubble EVA comprehensive training shoes and the existing EVA comprehensive training shoes when the lower limbs dynamics and kinematics differences.The Impact test uses a dynamic impact tester to impact the heel,and later with the difference in mechanical properties of the material to study the heel cushioning and rebound.Results: Biomechanical test results: the peak 1 maximum loading rate C is the smallest,the peak 2 maximum loading rate C is the smallest,the peak 2 mean loading rate D is the smallest,followed by C,the peak C is the smallest,and the grounding time C is the most Long,there are statistical significant between the five indicators A,B,C,and D.Kinetic index C shows the best cushioning.The shoe's landing angle(sagittal)is the largest,the shoe's ground angle(front)is the largest D,followed by C,the full-foot movement angle(front)D is the largest,the ankle varus angle(front)D is the largest,and the ankle joint is the maximum angular velocity.The amount of D is the largest,and the maximum angular velocity(sagittal)D of the knee joint is the smallest,followed by C.There are statistical significant between the six indicators A,B,C,and D.The three different midsole EVA comprehensive training shoes have no lower heel stability than the existing EVA comprehensive training shoes.Impact test results: The impact of the impact test without the insole and the impact of the insole C is the largest,C cushioning effect is the best,consistent with the biomechanical test results,the impact test Post test indicators did not show the Pre test indicators The same trend of biomechanical running test,the three midsole bubble EVA comprehensive training shoes may have cracked or irreversible deformation of the midsole bubble,precisely because of cracking or irreversible deformation The systemic trend of the indicators before and after the test is different.Conclusions: Biomechanical test research conclusion: Biomechanical test The existing EVA comprehensive training shoes have the worst cushioning effect,and the cushioning effect of C in the three different midsole bubble EVA comprehensive training shoes is the best.Compared with the existing EVA comprehensive training shoes,the midsole bubble EVA comprehensive training shoes have not reduced the heel stability,and the three different midsole bubbles do not show which one is stable and better.Impact test study conclusion: The existing EVA comprehensive shoes in the four test shoes have the worst cushioning effect.The cushioning of the three different midsole EVA comprehensive training shoes B is the worst.The midsole material exhibits attenuating properties.