Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： The changes of peak flexion and extension moments , peak power, joint work , joint impulsemoments , and cumulative joint impulse moments per unit distance of knee and ankle joints at different nun-ning speeds were compared to explore the effects of different running speeds on the single touchdown loadand cumulative load characteristics of lower limb joints. 'Twelve young male college students were recruitedas subjects , and the kinetic parameters of their knee and ankle joints were collected simultaneously using VICON infrared high-speed motion capture system and Bertec Fit 3D ergometer at four speeds of 8 km/ h,10 km/h,12 km/h and 14 km/ h. The peak flexion and extension moments , peak power , joint work , impulsemoments and joint cumulative impulse moments per unit distance of knee and ankle joints were analyzed.'The results show that the plantarflexion peak moment of the ankle during the support period , the peak pow-er during the landing cushion period and the off-ground pedal extension period and the joint work by theankle joint all increase significantly ( P<0.05) with the increase of speed. But , the peak extension mo-ment , peak power and joint work of knee during the support period do not change significantly (P>0.05)with the increase of speed. The cumulative impulse moments of the knee and ankle joints during the 1 kmrun decreased significantly (P<0.05) with the increase of speed , and the single step impulse moments ofthe knee and ankle joints do not change significantly (P>0.05 ). The increase of running speed do notaffect the single touchdown impulse moments of the ankle and knee in male college students , but it canreduce the cumulative impulse moments per unit distance of the knee and ankle joints. The plantarflexionpeak moment , peak power , and joint work in the ankle joint in male college students increase significantlywith the increase of running speed.Therefore , within a certain speed range , the increase in nunning speeddoes not increase the risk of knee , while the effect of running speed on the ankle needs further study.
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