Fig. 4

A mosaic plot showing the frequencies of the first recovery step strategies during multiple-step reaction trials at increasing magnitudes of perturbation for non-fallers (a), one-time fallers (b), and recurrent fallers (c). Note: A mosaic plot is a graphical display of the leg strategy frequencies (Y axis) by perturbation magnitudes (X axis) during the multiple-step reactions. The widths of the boxes are proportional to the percentage of steps performed out of the total stepping reactions (the number of multiple-step reactions at each magnitude presented at the top of each graph). The heights of the boxes are proportional to the percent of the strategies used to recover from balance loss at each perturbation magnitude level. The isolated right column summarizes all the frequencies of the leg strategies during all magnitudes. Abbreviations: LLSS, loaded leg side step; ULSS – unloaded leg side step; COS – crossover step; Leg Abduction – abducting the unloaded leg; Col - leg collisions