Biomechanical Study Of Lower Limbs Landing On Wedge-shaped Support Surface

Purposes:Landing action is widespread in daily life and sports.The impact of landing,high ground reaction and other factors can cause damage to the neuromuscular and skeletal system.In this study,the biomechanical characteristics of the lower limbs on the wedge-shaped support surface that jumped on 0° ground,inversion 5°,inversion 10°,eversion 5°,and eversion 10° were studied to explore the jump on the normal ground.The biomechanical difference of the buffering action during the inversion and the valgus slope provides a theoretical basis for enriching the research content of the jumping motion and preventing the lower limb injury during the jumping.Methods:Twelve sports majors with exercise habits were selected as experimental subjects.The VICON infrared motion capture analysis system and KISTLER force platform were used to collect the kinematics and kinetics indexes of the subjects during the 60CM altitude jump landing.The data of kinematics and kinetics of the experimental objects were collected under different limited conditions,i.e.different angles of landing on the ground,and then the data were statistically processed by using One-way repeated measurement analysis of variance.Results:(1)There is a significant difference in the maximum internal and external valgus angle of the knee joint between different plane angles(P<0.01).The maximum valgus value of the knee joint is 10° and 10° inversion compared with 0° ground.Significant upward trend;(2)Fz(vertical direction)ground reaction force peak difference between different plane angles is significant(P<0.05),and the inversion plane and the eversion plane are reduced in vertical direction compared with 0° ground.The peak value of the ground reaction force;(3)The peak of the Fy(inside and outside direction)ground reaction force at the maximum flexion moment of the knee joint has a very significant difference(P<0.01),and the angle of the eversion plane increases compared with the 0 degree ground.After the large Fy peak becomes larger,the Fy peak becomes smaller after the inversion plane angle increases;(4)The Fx(front-rear direction)ground reaction force peak between different plane angles has a very significant difference(P<0.01),and 0° Compared to the ground,the increase in the angle of the inversion plane and the everted plane reduces the peak of the ground reaction force in the front and rear direction.Conclusions:(1)Jumping on the wedge-shaped support surface,different angles of valgus have a certain effect on the biomechanical performance of lower limb joints in the process of human jumping.(2)The knee joint showed knee varus in the whole process of landing buffer,and the angle of knee varus was positively correlated with the angle of wedge support surface.(3)when jumping on the wedge-shaped support surface,whether it is the valgus plane or the valgus plane,the human bodyundefineds landing buffer tends to reduce the vertical ground reaction by expanding the flexion angle of the joint.Reduce the ground reaction in the front and rear directions by controlling the posture of the body.