The Effect of Increasing Running Speed on Kinetic Ratio of Lower Limbs in Closed Kinetic Chain

Given that walking and running are prevalent and common activities of all human beings in a normal state, recognizing actions and reactions by the lower limbs is of great importance of the body function. The aim of the present study was to investigate the effects of increasing running speed on the kinetic ratio of the lower limbs in closed kinetic chain. ۲۳ runners were asked to stay on the belt speed of treadmill that was incrementally increased to the speeds of ۲.۵ m.s-۱, ۳.۵ m.s-۱ and ۴.۵ m.s-۱, respectively. The three dimensional joint moments of the lower limbs during closed kinetics chain of running were calculated. The ratio of the joints moments were calculated in proximal to distal (Hip to knee, Knee to ankle and Hip to Ankle). Mean average of the ration were considered for further analysis. Repeated measures analyses of Variance with Bonferroni post Hoc test were conducted to examine the joints’ ratio during running at various speeds using SPSS (P<۰.۰۵). The results showed that there were no significant differences between joints’ moments ratio in all three sagittal, frontal and transverse planes through increasing speeds. In sagittal plane, the highest value were reported at ۳.۵ m/s for Hip to knee and ۲.۵ m/s for Knee to Ankle as well as Hip to Ankle moment’s ratio, in Frontal plane, it was ۳.۵ m/s demonstrated the highest value of the all ratio and finally in transverse plane, ۴.۵ m/s for Hip to knee and Hip to Ankle also, ۳.۵ m/s for Knee to ankle were the highest values. The compensative procedure may be a logical reason for insignificant results of the study regarding biomechanics of the lower joints in closed kinetics chain.

کلیدواژه ها:

Running ، Kinetics ، kinetic chain ، Lower limb