Figure 1From: Toe clearance and velocity profiles of young and elderly during walking on sloped surfacesOptotrak marker positions. Optotrak marker positions that were used to predict the lowest point on the shoe. L1, L2, L3 and L4 represent the real markers located on rigid body. V1, V2 and V3 (first, third and fifth metatarsals) represent the virtual markers.Back to article page