Summary of force field 20% effects on ankle kinematics. a. Time course of ankle velocity across walking conditions. Each grey symbol represents a stride. Black symbols represent an 11 points moving average. Open symbols represent catch strides. b. Group results (n = 11) expressed as % difference from control for the 2 epochs in each walking condition. Error bars represent 95% confidence intervals. *: Epochs statistically different from baseline (P < 0.05; repeated measure ANOVA with Bonferonni correction).