Fig. 5. The mean participant-dependent first PC about three spatial directions. Here the participant-dependent first PCs were averaged across the 10 study participants. Error bars are one standard deviation about the mean. The abscissa numbers and human model segments are paired to the right of the figure. In the anterior–posterior (y) direction, large variations in the relative contribution of angular momentum are observed for the pelvis and abdomen (segment 13), chest (segment 14) and head (segment 16) [see large standard deviations in Fig. 5 for PC₁ (y)].