| Purpose:As a sprinting technique and special strength training method,the influence of non-motorized treadmill training on sprinting technique is not clear,therefore,through the change of physical fitness and sprint technique of the experimental subjects after 8 weeks of non-motorized treadmill training experiment,the purpose is to explore the influence of non-motorized treadmill training on sprint technique and athletic performance,and provide reference for the diversification and scientific means of sprint technique and special strength training.Methods: By using the training experiment method and the analysis of kinematics test,10 sprinters from the physical education major of Wuhan Sport University in Grade 2021,about Level 2,were selected as the experimental subjects to conduct the special strength training of non-motorized treadmill sprinting 3 times a week for 8 weeks,and the changes in the kinematic parameters of the athletes’ physical fitness and sprint techniques before and after the experiment were analyzed and compared.The following conclusions are drawn:1.Non-motorized treadmill training has improved the speed ability of athletes,among which the performance of 30 m and 60 m has been significantly improved compared with that before the experiment,and the performance of 100 m has been significantly improved compared with that before the experiment.Non-motorized treadmill training has a good effect on acceleration ability,maximum speed ability and speed retention ability of athletes.2.Non-motorized treadmill training has a positive effect on the overall kinematic index of sprint: the stride frequency increases significantly,the single step time decreases,and the air time decreases.Increase the air distance,step length and support distance;The overall center of gravity horizontal speed is increased and the technical structure of mid-run single step is optimized.3.Non-motorized treadmill training has a positive effect on the kinematic indexes of the hips in the sprint support stage: the landing hip Angle of the supporting leg is significantly reduced,the hip Angle off the ground is significantly increased,and the hip extension range and hip extension angular velocity of the supporting leg are significantly increased;The angular velocity and amplitude of hip flexion of the swinging leg are significantly increased,which is conducive to the fast clipping and twisting of the two thighs and the eventual improvement of running speed.4.Non-motorized treadmill training has a positive effect on the knee kinematic indexes in sprint support stage: the reduction of the knee landing Angle and the Angle off the ground makes the athletes land more actively and improves the knee stiffness of the supporting leg.The reduction of knee landing Angle,knee bending amplitude and knee extension amplitude of the swinging leg are conducive to the full folding of the swinging leg,thus improving the front swing speed of the swinging leg.5.Non-motorized treadmill training has a beneficial effect on the ankle kinematics index in the sprint support stage: the average Angle of the ankle joint of the athlete’s support leg decreases,which makes the athlete’s ankle form a greater dorsiflexion in the whole support process,which is conducive to the formation of a stable support,and assists the extensor hip muscle group to play a greater role of "back stroke".Swing the leg to a smaller Angle of the ankle,which helps to prevent a lack of initiative to bend the knee,thus improving knee folding and a faster forward swing.6.Non-motorized treadmill training increased the shear and twisting speed of the athletes’ two thighs,improved the hip extension speed of the supporting legs in the supporting stage,and increased the strength of the extensor muscle of the hip muscle group more than that of the flexor muscle.Since the running platform has a certain arc and load,athletes will subconsciously push out in advance after landing,resulting in too much "back lift",which has a negative impact on the mid-run technique. |
