The Effects Of Different Materials On The Muscle Tuning And The Stiffness Of Lower Limbs In The Course Of Human Running

PurposeIt is found that there are relatively few studies on the effects of the surface materials on the mechanism of neural-muscular regulation in the movement of the body.This study integrated application of biomechanics of dynamics and kinematics methods and methods of electric technology,to discuss the changes of muscle tuning and the stiffness of lower limbs in the course of the running of different sports surfaces(treadmill,asphalt road,plastic runway,grassland).Understanding the mechanism of neuromuscular regulation during running on different sports surfaces,and the mechanism of muscule tuning in preventing sports injury.And to put forward rationalization suggestions for the selection of the venue in running exercise.MethodsFourteen average male college students were selected to run on treadmill,asphalt road,plastic runway and grassland at a fixed pace.In real time,the sEMG were collected during running on the four sports surfaces,and the acceleration value of the tibial bone was collected,and the subjects’running video was synchronized.This paper analyzed the changes of the electromyography(the integral electromyography and the mean square amplitude)and the changes of the tibial acceleration data during the running of the four sports surfaces,and analyzed the two dimensional analysis of video.Results1.There was no statistical difference in the impact of the axial direction of the tibial shaft on the lower extremities during the running of different materials.The acceleration value of the lower extremity in the front and left direction of the asphalt road,the plastic runway and the grass is the higher the surface hardness,the smaller the acceleration value is..2.The stiffness of the lower limb of the treadmill was significantly higher than that of other sports surfaces.The stiffness of the lower limb in the asphalt road,plastic runway and grassland shows the higher ground hardness,and the lower limb stiffness value tends to change.3.The RMS and iEMG values of the treadmill running were generally lower than those of the other three surfaces.On the other three kinematics,the EMG data generally showed the higher the hardness of the ground,the greater the change of the olectromyography(RMS and iEMG)4.The EMG data(RMS and iEMG)of the lower extremity muscles were more than 50ms before the shock.5.The muscle vibration frequency of the first 100-200ms after the maximum of the muscle acceleration was significantly lower than the muscle vibration frequency of the 0-100ms after the maximum of the muscle acceleration.Conclusion and Suggestion1.The material of the sport surface,especially the hardness of the ground,can affect the stiffness of lower limb in human running.Generally speaking,the larger the surface hardness,the lower the lower limb stiffness.2 The surface texture can affect the muscle activity condition.The higher the surface hardness,the higher the degree of muscle activation.3 When the human body is affected,it can produce a significant change in the frequency of muscle discharge and muscle vibration.4 In the movement.,the human body has a muscle tuning phenomenon,and in the process of the movement,people will be able to make a series of self-tuning according to the ground conditions and landing conditions to avoid sports injuries.5 The muscle activity of the human body during running and the regulation of the stiffness of lower limb are different from that of normal ground running.6 It is reconmended that you avoid running on a site with high hardness to prevent repeated impact on joints and muscles.When running on different material sports surfaces,you should adjust your fitness strategy to prevent damage.