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

Figure 1

Photo of a subject walking on an instrumented treadmill while being embraced by the BAR-TM perturbing device; projection on the wall shows the middle of the BAR-TM working space as well as the current position and orientation of the pelvis in a transverse plane—the subjects were instructed to return to the middle of the BAR-TM working space after they rejected perturbation (a). Top view illustration of perturbation directions: outward RR: perturbation to the right triggered at right-foot contact; inward RL: perturbation to the left triggered at right-foot contact; outward LL: perturbation to the left triggered at left-foot contact; inward LR: perturbation to the right triggered at left-foot contact (b).