Gray Correlation Analysis On Biomechanical Factors Associated With Forward Fencing Lunge Velocity

ObjectiveIn order to discuss muscle strength, the swinging speed and joint Angle of rearleg’s each joint for lunges speed influence. this research select peak torque of rear leg，s knees and ankle, maximal joint angular velocity for rear leg，s knee and ankle withjoint angles of rear leg，s knee and ankle when action happened and Using greycorrelation analysis method to analyze the correlation degree of these indicators affectlunges speed.find out the important Impact factor on lunge performance, So as toprovide biomechanical basis for fencing athletes special strength training.MethodsFencing lunge of12fencers were recorded by3D when performing forward lungefrom their rear legs on-guard position on a force platform. In the process of the entirefencing lunge, maximal Horizontal speed of body gravity, peak torque of rear leg，sknees and ankle, maximal joint angular velocity for rear leg，s knee and ankle withjoint angles of rear leg，s knee and ankle when action happened were then calculatedby VISUAL3D analysis software. Factors influencing maximal Horizontal speed ofbody gravity were analyzed using gray correlation methods.Result1Influence factors contribute to maximal Horizontal speed of body gravity fromhigh to low presents as: ankle joint peak torque> knee joint angle> knee joint peaktorque,>ankle joint angle>ankle joint velocity>knee joint velocity.2knee joint angle，s degree of influence contribute to maximal Horizontal speed ofbody gravity greater than the peak torque of knee, But from the point of view ofcorrelation degree and weight value, Knee joint angle (ri=0.7192) and knee peak ofknee (ri=0.7173), the influence degree is generally low.3peak torque of knees and ankle, maximal joint angular velocity for knee andankle with joint angles of knee and ankle contribute to maximal Horizontal speed ofbody gravity from high to low presents as: ankle joint peak torque> knee joint peaktorque,knee joint angle>ankle joint angle, ankle joint velocity>knee joint velocity.Conclusion1The results indicate that it should give priorities to develop fencers’ musclestrength to improve the velocity of fencing lunge in rear leg’s practice. Therefore, Inorder to improve the speed of lunges, quadriceps strength, plantar flexor concentriccontraction strength, ankle explosive stretch should be strengthened in trainingpractice.2Basic fencing posture should be strengthened in training practice, As whenpreparing forward lunges thorns as far as possible reduce the center of gravity andincrease the initial Angle of the knee joint, It was beneficial to the improvement of thespeed lunge of fencers.