Figure 2. The fast runners have significantly more peak knee flexion during support than the slow runners at both mile 5 (8 km) (p < 0.001) and mile 25 (40 km) (p<0.001). The difference between miles 5 (8 km) and 25 (40 km) was also significant, which indicated that the fast runners decreased their peak knee flexion during support significantly less than the slow runners (p < 0.002).