Biomechanical Analysis Of The Backhand-side Court’s Jump-smashing Of Male Badminton Players At Different Levels

The badminton’s jumping and landing movements have more injuries,but there are fewer articles on it.This paper compares the biomechanical differences between different levels of male athletes’ single-footed jump shots in the overhead zone,analyzes the impact of horizontal factors on the landing action,and studies the biomechanical factors that may affect the single-footed jump shots in the overhead zone of badminton players It provides suggestions for preventing badminton professional athletes and enthusiasts from damaging the ball in the overhead area,and also provides reference for subsequent research on badminton landing.Methods: The subjects of this experiment were 24 male badminton college students(11 high-level athletes and 13 sports badminton college students)from Beijing Sport University,and the subjects were divided into two groups according to their level.The infrared high-speed motion capture system(200Hz)and the three-dimensional force plate(1000Hz)were used to collect the kinetic and kinematic data of the landing movement of the ball in the overhead area.The data uses an independent sample t test to analyze the index difference between high-level athletes and low-level athletes on the ground.Results: At the moment of ground contact,the external rotation angles of the ankle and knee joints of low-level athletes were significantly larger than those of high-level athletes(p=0.001),and the internal rotation angles of hip joints were smaller than those of high-level athletes(p=0.017).Peak and knee external rotation are significantly larger than those of high-level athletes(p<0.05);the range of flexion and extension of the ankle joints of low-level athletes is greater than that of high-level athletes(p=0.014);p= 0.000)and peak extension torque(p=0.016)are significantly larger than those of high-level athletes.Peak hip extension torque is smaller than that of high-level athletes(p=0.032).Low-level athletes ’knee varus torque at the time of contact with the ground(p=0.015))And knee varus torque peak(p=0.001)is greater than high-level athletes;low-level athletes have ankle and knee vertical axis moments greater than high-level athletes(p<0.05);knees of low-level athletes The energy contribution rate(p = 0.006)is larger than that of high-level athletes,and the energy contribution rate of hip joints(p=0.007)is smaller than that of high-level athletes;There were no significant differences in reaction forces(p>0.05).Conclusions: 1.Compared with high-level athletes,low-level athletes hit the ground with more rigid movements,and the larger sagittal axis and vertical axis angle may make their lower limb joints have a higher risk of injury.2.Compared with high-level athletes,low-level athletes ’knee joints are subject to greater shear forces and larger sagittal axis and vertical axis moments may make low-level athletes’ lower limb joints more vulnerable to damage.3.The ankle joint is the most energy-absorbing joint in the landing of high-level athletes and low-level athletes.Low-level athletes use knee joints for absorption.High-level athletes first use hip joints for absorption.The ground impact is large,which may cause low-level athletes to have greater risk of injury to the knee joint.