Figure 2:

Relationship between foot and ankle angle at initial contact and VILR at four running speeds (3.2, 4.1, 5.1 and 6.2 m·s⁻¹). On the left side: mid- and forefoot contact patterns and the relationship between ankle angle at initial contact and VILR. On the right side: rearfoot contact patterns and the relationship between foot angle at initial contact and VILR. Note that this is a separate x-axis for both foot contact pattern groups as for both foot contact pattern groups a different kinematic parameter shows the best correlation with VILR. For each running speed, and per subgroup (left: mid- and forefoot contact patterns, right: rearfoot contact patterns) the linear regression and associated adj. R² between ankle (mid-forefoot) or foot angle (rearfoot) at initial contact and VILR is shown. The black circles indicate the data points associated with a typical non-transition runner who maintains a typical rearfoot contact pattern at all running speeds. The black squares indicate the data points of a transition runner who shifts towards a midfoot contact pattern at 5.1 m·s⁻¹ and towards a forefoot contact pattern at 6.2 m·s^-1.