FIGURE 4.

Linear regression models of double support time of the fast and slow leg and cadence, with age as predictor during the initial perturbation (steps 1–5 of split-belt walking; left panel), early change (steps 6–30 of split-belt walking; middle panel), and fast/slow baseline (right panel). The color of the data points changes with increasing age. The formula of the regression line is given at the top of each graph. When the models were significant, the P value and R² value of the model are given in bold. DS, double support time; Cad, cadence.