Research On The Kinematics Characteristics Of Female Badminton Players’ Single-leg Landing Movements In The Overhead Field Area

In badminton,the number of injuries caused by athletes in competition is higher than that in training,and the injury probability of female athletes is more than twice that of men.In badminton,the frequency of striding in the overhead court area is relatively high,so that the lower limbs generate a greater load during the landing stage.Combining the badminton action,it was found that landing on one leg after hitting the ball in the overhead court area is likely to cause knee joint injury,which is mainly characterized by trunk tilt,knee joint valgus and hip joint abduction.In the current research on badminton action,there is a lack of measurement and analysis of actual game data and trunk,and related research points out that the trunk gravity acceleration has a high correlation with the peak vertical ground reaction.Therefore,this study summarizes the movement characteristics and laws of female badminton players’ single-leg landing movements in the three-dimensional space in the overhead court area from the perspective of the competition environment.Research purposes:This study analyzes the kinematic characteristics of female badminton players’ single-leg landing movements in the overhead court area from the perspectives of space and time,summarizes the characteristics and laws of excessive acceleration movements,and provides a theoretical reference for identifying vulnerable movements.Significance:From the perspective of kinematics,increase the relevant research on the trunk in badminton landing movements,provide a theoretical basis for the improvement of badminton players’ technical movements and special skills,understand the importance of the trunk in technical movements,and improve the stability of the moving torso,so that coaches can identify High-risk single-leg landings.research method:In this study,seven female badminton athletes from Shanghai Institute of Physical Education at the national second-level and above were selected as the research objects.Using a three-dimensional acceleration sensor(sampling frequency:100Hz)and a camera(sampling frequency: 60Hz)to synchronously collect the subject’s torso gravitational acceleration during the game with the overhand shot technique in the overhead field area and landing on one leg,and collected using the Dartfish two-dimensional plane analysis software Trunk roll angle and hip abduction angle when the forefoot touches the ground and when the heel touches the ground.In SPSS26.0 software,the independent sample t test was used to compare the trunk acceleration characteristics of the single-leg landing action of different overhand shots in the overhead field area,and describe the trunk roll angle and hip joint abduction angle characteristics of the overhand shot single-leg landing action in the overhead field area.And the correlation between trunk acceleration,trunk roll angle and hip joint abduction angle,to compare and analyze the trunk roll angle and hip joint angle when the trunk acceleration is too large.Research result:1.On the coronal axis,the forehand slash high ball,the forehand lob,and the overhead slash lob have a large acceleration of single-leg landing action in the overhead field area and are all greater than 2g;on the vertical axis,the forehand straight line high ball,On the sagittal axis,the acceleration of the torso on the single-leg landing of each overhand shot is relatively small and all less than 2g.2.In the overhand shot in the overhead field area,the joint angle at the touchdown time is greater than the joint angle at the landing time,and the trunk roll angle and hip joint abduction angle of the overhead technique are greater than those of the forehand technique;the combined acceleration and the high-distance ball and the single-leg lob are There was a negative correlation between the trunk roll angle in the landing action(p<0.01);the coronal axis acceleration was negatively correlated with the hip joint abduction angle in the high ball and smashing single-leg landing actions(p<0.01,p<0.05);the vertical axis acceleration was negatively correlated with the There is a positive correlation between the trunk roll angle in the single-leg landing action of lob and smash(p < 0.05),and a positive correlation with the hip joint abduction angle in the single-leg landing action of high ball and smash(p < 0.01);sagittal acceleration There was a positive correlation with the trunk roll angle(p <0.01)in the single-leg landing action of the high ball and the lob,and a positive correlation with the hip joint abduction angle in the single-leg landing action with the lob(p < 0.05).3.In the single-leg landing action of the overhand shot in the overhead court area,there are 24 actions in which the trunk acceleration of the overhand shot technique is greater than 4g,and most of them are smashed in a straight line above the head.Compared with actions with trunk acceleration less than 4g,the trunk roll angle and hip joint abduction angle are larger or smaller,and there are overhand shots with large angle deviation.Leg landing action.Analysis conclusion:1.When a female badminton player hits the ball with a single leg in the overhead court area,the torso generates a large gravitational acceleration on the coronal axis and the vertical axis.2.Female badminton players hit the ball in the overhead field with a single-leg landing action.The angle of the trunk and hip joint is relatively large at the initial touchdown stage,and the joint angle has a high correlation with the three-axis acceleration.big.3.For female badminton players in different overhand shots in the overhead court area,the trunk roll angle and hip joint abduction angle are too large or too large compared with the average angle of the action of less than 4 times the acceleration of gravity.Small angular features.