Biomechanical Research On Second-level Female Badminton Athletes Between The Dominant And Non-dominant During Landing

Objective:In badminton,athletes need to make some coherent and complex actions in a short time such as rapid-stop,rapid-turn,take-off,kick-span,etc.In badminton footwork,different landing heights and modes will lead to different landing performance.Compared with male,female have a greater risk of injury on landing,and badminton athletes have both dominant and non-dominant lower limbs.Therefore,it has a great practical significance to study the dominant and non-dominant lower limbs landing of badminton women athletes.It hopes to provide theoretical basis for the injury prevention of badminton sports and clinical rehabilitation training.Methods:This paper chose 14 second-level female badminton athletes,landing heights were 25cm,35cm,45cm,research content was landing motion characteristics of the dominant and non-dominant sides of the lower limbs.Kinematics,dynamics,flexion and extension muscle force,and dynamic and static balance indexes of the dominant and non-dominant sides of the lower limbs were measured by constant velocity camera,three-dimensional measuring force platform,isokinetic muscle testing system and balance ability testing system.Two-way anova was used to analyze characteristic indexes of lower limb landing,and paired sample t test was used to analyze isokinetic muscle strength and balance indexes.Results:1.When the biggest knee flexes at the cushioning stage of landing,there were significant differences in the X,Y and Z axes center of gravity of the dominant and non-dominant sides of the lower limbs in side and height.The angles of hip,knee and ankle were very significant different in side and height.2.The first wave peak/body weight of F_Y and F_Z and the second wave peak/body weight of F_Y and F_Z showed significant differences in side and height.3.There were significant differences in the peak torques and relative peak torques of flexor in the dominant and non-dominant knee joints.There were significant differences between the peak torques and relative peak torques of the extensor.4.The static balance indexes of the dominant side were smaller than those of the non-dominant side,but there was no significant difference in statistics.The dynamic balance indexes of the dominant side is smaller than those of the non-dominant side,and the difference was very significant.Conclusions:The laterality of the lower limbs of female badminton players would lead to different landing performance.The increase of landing height would make athletes gradually increase the extent of hip-flexes,knee-flexes and ankle-back during the buffering stage.When landing on the dominant side of the lower limbs,the migration of the lower limbs and the swing of the trunk were significantly smaller.The buffering effect was better,but the impact force was larger in the vertical direction.The landing limb on the non-dominant side of the lower limb tended to tilt outward.The first wave peak value appeared earlier in buffering,which can bear more impact force in the lateral direction,resulting in poor buffering effect.It was easy to cause joint ligament strain.The extensor ability and dynamic balance ability of the non-dominant knee joint were obviously weaker than that of the dominant knee joint,there was little difference in static balance between the two sides.