Figure 5

FTIR force data obtained during drop jumps. Data are shown for the force exerted on the platforms beneath the left (blue) and right (red) feet during a drop jump manoeuvre performed by a subject wearing shoes with blue outsoles (panel a) and a second subject wearing shoes with red outshoes (panel b). In both cases the force data are obtained by summing the pressures obtained from FTIR contact images (examples of which are shown as insets). The total force exerted on both platforms (green) was obtained by summing the red and blue curves. The legends on the right hand side of the panels give the correspondence between the colour and pressure in the contact pressure map images shown as insets. The inset in both panels also show simple photographs of the tread pattern on the underside of the shoes.