Research Of Biomechanic Characteristic Of Lower Limbs Motion In Jogging

With the methods of Qualisys infrared light spot kinematic analysis system,Kistleri strength testing system,foot base pressure distributing system and Mega EMG system,this reserch made a comprehensively study into the kinematic,dynamics,foot pressure and EMG quota of the waist and leg action in jogging.Based on the datum, the mechanics issue of running injury is analysed in the same time.The results are indicated as follows:1.The touchdown posture of comparatively level foot can provide the bigger movement space for the cushion of the successor back bending, increase the touchdown area of foot step,lighten the intensity of pressure produced by impact at the foot base,thus reduced the harm to foot base.The wider scope of foot expanding and bending,the more advantageous to the buffer of the impact.2.When jog fitness it is advisable to put on the soft bottom shoes,which reduces the impact of the ground on the foot and even the whole body; The influence of running in shoes or barefoot running on the foot stress is mainly on the touchdown stage.3.Regardless of running in shoes or barefoot running,the amount of impulse and the intensity of pressure on the 2nd,1st,3rd metatarsal bones are ralatively great,especially the 2nd metatarsal bone the greatest,while the amount of impulse and the intensity of pressure on the calcaneum and the 5th metatarsal bone are comparatively small.Thus it can be seen that the jog chronic diseases,fatigue damageespecially freqyently occur to the 2nd,1st,3rd metatarsal bones region and the 2nd metatarsal bone in particular.4.The muscle groups are comparatively active before and after the foot touchdown of the ground;they becme less active before the foot clearance of the ground.The action of touchdown is more important than the action of clearance during the movement period.5.In the lower limb movement technology of running for fitness,the muscles generate strength mainly in the cushion stage.The potential energy and the inertia stored up during the cushion stage contribute a lot to the power of pressing and expanding process.6.The cushion stage,the knee joint is main spot of the cushion movement; while the ankle joint stands more external force during thepressing and expanding process.