Figure 2
From: Lower trunk motion and speed-dependence during walking
RMS acceleration (a), Coefficient of Multiple Determination (b), and Approximate Entropy (c), derived from lower trunk accelerations in the vertical (VT), anterior-posterior (AP), and mediolateral (ML) direction. Cross Approximate Entropy (d) representing strength of coupling between accelerations in the vertical and anterior-posterior (VT-AP), anterior-posterior and mediolateral (AP-ML), and vertical and mediolateral (VT-ML) directions. All data is presented for slow, preferred, and fast walking speeds. Error bars represent one standard error of the mean.