Figure 4From: The generation of centripetal force when walking in a circle: insight from the distribution of ground reaction forces recorded by plantar insoles Asymmetry index (AI) of the estimated ground reaction force distribution at the heel, metatarsal heads, arches and toes of the foot during linear (LIN) and curved trajectories (Foot-In, Foot-Out). In the ordinate, larger negative values (average ± standard error, SE) of AI represent an increase in vGRF on the lateral part of the relevant foot region. During curved walking, AI of the Foot-Out heel became more negative than that of LIN foot and Foot-In. On the contrary, AI became less negative for Foot-In with respect to LIN foot. At the metatarsal heads, AI showed the opposite behaviour: for Foot-Out, it became slightly less negative with respect to LIN foot. On the contrary, for Foot-In, it became more negative than LIN foot and Foot-Out. *, p < 0.05; **, p < 0.005; ***, p < 0.0005.Back to article page