Biomechanical Differences in Lower Extremity Joints During Landing Cushioning Phase of Short Sprinters Jumping Over Obstacles of Different Heights
OBJECTIVE:This study aims to investigate the influence of jumping over obstacles of different heights on the risk of knee joint injuries during the landing cushioning stage for short sprinters.METHODS:Nineteen short sprinters were recruited,and three-dimensional motion capture system QUALISYS and KISTLER force plates were used to simultaneously collect kinematic and kinetic parameters of lower limb joints during the landing phase after jumping over obstacles.RESULTS:Compared to jumping over a 60cm high obstacle,jumping over a 75cm high obstacle significantly increased ankle and hip joint angular velocities during the landing cushioning stage(P＜0.05).Jumping over a 90cm high obstacle significantly increased ankle,knee,and hip joint angular velocities,knee joint energy dissipation percentage,patellofemoral joint force and stress,as well as the peak resultant ground reaction force(P＜0.05).CONCLUSION:As the height of the obstacle increases,athletes adopt a more proactive landing strategy by increasing knee joint flexion amplitude and reducing knee joint stiffness to cushion the impact load during landing and reduce the risk of knee joint injuries.Jumping over a 90cm high obstacle during the landing cushioning stage increases patellofemoral joint stress and knee joint energy dissipation,increasing the risk of patellofemoral joint injuries.SUGGESTION:Strengthen training of the gluteus maximus,gluteus medius,quadriceps femoris,and hamstring muscles to enhance muscle strength around the hip and knee joints and reduce joint stress.
jumping over obstaclesshort sprintersknee joint injurieslanding
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