Postural Stability in Human Running with Step-down Perturbations: An Experimental and Numerical Study

摘要: Postural stability is one of the most crucial elements in bipedal locomotion. Bipeds are dynamically unstable and need to maintain their trunk upright against rotations induced by ground reaction forces (GRFs), especially when running. Gait studies report that GRF vectors focus around a virtual point above center mass (VPA), while moves forward pitch axis during stance phase human However, recent simulation study suggests below (VPB) might be present running, since VPA yields backward rotation phase. In this work, we perform gait analysis investigate existence location VP running at 5 ms-1, support our findings numerically using spring-loaded inverted pendulum model with (TSLIP). We extend include perturbations terrain height (visible camouflaged), response mechanism step-down both experimentally numerically. Our experimental results show displays VPB ~-30cm motion The camouflaged affect VPB. suggest able encounter bring system back its initial equilibrium state.