Fig. 4

Speeds measured in the self-selected walking speed tests. The self-selected walking speeds measured in a Overground 150 m, b Manual Speed Selection, c Self-Paced 2 min, and d Self-Paced 150 m are compared to those from Overground 10 m. The data points relate a self-selected walking speed measured in a test to the one measured in the standard test in the same block. Each data point is a mean of four measurements (Fig. 2), with whiskers depicting ±1 standard deviation. The exception is for Manual Speed Selection, where the standard deviation is for two measurements because a pair of faster and slower than comfortable speeds are required to obtain one measurement of comfortable speed. Three data points from the same subject are connected with a line and marked in the same color. The linear model, correlation coefficient, and p-value for the fit are shown at the bottom right of each plot