Influence of Treadmill Speed and Perturbation Intensity on Selection of Balancing Strategies during Slow Walking Perturbed in the Frontal Plane

Figure 4

Kinematics and kinetics of balancing responses following inward RL perturbation assessed in a representative subject. The first row shows the trajectories of COP_ML (solid lines) and COM_ML (dotted lines), while the second row shows GRF_ML trajectories. The third row shows COP_AP (solid lines) and COM_AP (dotted lines) trajectories, while the fourth row shows GRF_AP trajectories. Each graph contains responses to all three perturbation intensities along with the trajectories assessed during the unperturbed walking sessions. The left, middle, and right columns show the balancing responses at speeds S₁, S₂, and S₃, respectively. Half a stride prior to and one and a half strides following the perturbation commencement are shown. A stride is defined as the period between two consecutive right-foot contacts. The trajectories displayed show mean values of seven balancing responses.