Figure 1.
Close-up images of subjects using a rearfoot strike (A) and a midfoot strike (B).
Most Daasanach subjects used a rearfoot strike (A) at their self-selected endurance running speeds, rather than a midfoot strike (B) or a forefoot strike (not shown).
Figure 2.
Frequencies of strike patterns by running speed.
The majority of the Daasanach sample group used a RFS (black circles) when running at Froude speeds less than 2.5. For Froude speeds greater than 2.5, RFS and MFS (white circles) running were observed with equal frequencies. FFS running (black triangles) was most frequently observed at the highest speeds (Froude >3.5), but this pattern was never used by the majority of the Daasanach sample group.
Table 1.
Foot strike patterns of Daasanach (N = 38) over 133 trials at preferred endurance running speeds.
Table 2.
Frequencies of foot strike patterns across running speeds.
Figure 3.
Least-squares regression of impact force by running speed.
A significant relationship was found between the relative magnitude of impact forces and running speed (y = 0.38+0.10×; r2 = 0.20, p<0.0001).
Table 3.
Mean residuals (and 95% confidence limits) from regression of relative impact force by running speed.