Differences In Biomechanical Characteristics Between Dominant And Non-dominant Leg During Side-jump Landing

Objective: The purpose is to study the differences in biomechanical characteristics between dominant and Non-dominant leg during side-jump landing,to discuss the biomechanics differences of the lower extremities between the dominant and non-dominant lateral limbs in the medial jump and the lateral jump,as well as the possible risk of injury,so as to provide a theoretical basis for pre-empting the drop strategy and preventing lower limb injuries,It also provides a reference for the scientific exercise of superior and inferior side lower extremities.Methods: Twenty-four male healthy subjects from Suzhou University Physical Education College were selected as the experimental subjects.The subjects had no history of lower extremity injury within six months.All subjects volunteered to participate in the experiment,but did not know the purpose of the experiment.The subjects then completed the dominant lateral medial jump(DM),dominant lateral jump(DL),non-dominant medial jump(ND-M),non-dominant lateral jump(ND).The jumping order is randomly chosen by the subject.Using VICON to acquire kinematic data during jumping and KISTLER force table to acquire kinetic data.Lateral jump distance from the medial or lateral edge to the force center 60 cm.Paired t-tests were used for all acquired kinematic and kinetic data for differences between the dominant side and the non-dominant side.Results: (1)Lateral jump to the stage,foot ankle varus angle,ankle maximum varus angle in the dominant side and non-dominant side of the significant difference between the dominant side is less than the non-dominant side(P<0.05),There was no significant difference in plantar flexion angle,maximal dorsal flexion,flexion and extension,and ankle varus movement between dominant and non-dominant sides(P>0.05).Hip and knee angle indicators showed no significant difference between the dominant side and the non-dominant side(P>0.05).(2)The maximum angular velocity of ankle,maximal flexion of knee joint and knee flexion time were significantly different between superior side and non-dominant side(P<0.05),superior side Were significantly smaller than the non-dominant side(P<0.05).There was no significant difference in maximal flexion angular velocity,maximal dorsiflexion angular velocity of ankle,maximal varus angle of ankle joint,hip joint and ankle joint cushioning time between dominant and non-dominant side hip(p> 0.05).(3)The maximum dorsiflexion angle,maximum ankle angle and maximal varus angle of the knee were significantly different between the dominant side and the non-dominant side(P<0.05),and the superior side ankle joint In the maximal dorsiflexion angle,the maximal varus angle of the knee was significantly smaller than that of the non-dominant side,while the maximal varus angle of the dominant lateral ankle joint was significantly larger than that of the non-dominant side(P<0.05).The plantar flexion angle of the dominant side and non-dominant side of the foot,the ankle varus angle at the time of the landing,the range of flexion and extension of the ankle joint and the flexion angle of the knee joint at the time of the foot flexion,the amplitude of the flexion of the knee joint,the magnitude of the varus movement of the ankle and knee No significant difference(P> 0.05),There was no significant difference in hip angle between the dominant side and the non-dominant side(P> 0.05).(4)The maximum dorsal flexion velocity of the ankle,maximum flexion velocity of the knee joint,knee and ankle cushioning time were significantly different between the dominant side and the non-dominant side(P<0.05).The maximal flexion angular velocity of dominant knee was significantly less than that of non-dominant knee(p <0.05),while the maximal dorsiflexion angular velocity of dominant knee was significantly greater than that of non-dominant knee(P<0.05)Non-predominant side(P<0.05).The maximum flexion angular velocity,hip joint cushioning time,maximal varus and knee ankle angular velocities did not show any significant difference between dominant and non-dominant sides(P>0.05).(5)PVGRF,TTP and Stiffness showed significant differences between dominant side and non-dominant side(P<0.05)),The PVGRF and Stiffness of the dominant side were significantly lower than those of the non-dominant side(P<0.05),while the peak time of dominant side(TTP)was significantly greater than that of the non-dominant side(P<0.05).In the lateral jump stage,the dominant lateral temporal force(GRF)was significantly less than that on the non-dominant side(P<0.05).Intrinsic and lateral falls There was no significant difference in LR between the dominant side and the non-dominant side(P>0.05),and the inward-jerking moment(GRF)between the dominant side and the non-dominant side Nor did they show any significant difference(P>0.05).Conclusion: (1)In the process of lateral leaping,whether it is jumping outwards or leaping inwards,the dominant side has shorter buffering time during landing and less movement on the frontal plane,indicating superiority and non-dominance.Side inconsistent performance in the way of landing buffer action.(2)In the process of lateral jumping,whether it is jumping to the outside or leaping to the inside,the dynamics of the lower extremities of the dominant side and the nondominant side are basically the same.However,non-dominance results in greater ground reaction forces,and the peak time decreases,increasing the risk of damage.(3)In the medial to leaping phase,the nondominant hip and knee flexion and extension range is smaller than the lateral extent,but the range of flexion and extension of the sacroiliac joint is larger,suggesting that the inward side skipping to the nondominant side of the ankle may be Prone to damage.(5)In the stage of lateral leaping,the dominant side buffered actively and the stiffness of the lower limb was smaller,indicating that the dominant side was good at applying protection strategies to prevent joint damage.