Effect of Speed and Incline on Rear Foot Angle during Jogging in People with Pronate Foot

The purpose of the present study was to identify the effect of speed and incline on Rear Foot Angle (RFA) during treadmill jogging in people with pronate foot.
A total of 15 male students were purposefully selected using navicular drop index. After measuring RFA according to Clarke (1983), each participant walked on the treadmill in three slopes (0°, 5°, and 10°), and three speeds (1/25 m/s, 2/2 m/s 5, 3/25 m/s), without shoes. The RFA angles were recorded during walking using two-dimensional motion caption system (Hp cosmos Para motion) making use of two cameras (125 Hz).
The results of Analysis of Variance with repeated measures showed that the RFA decreased with increasing inclination and speed of running in all phases of running, except for during toe-off the ground. Moreover, the results also showed that increase in the speed of running significantly increased the RFA angle in all phases of walking and running (p≤0/001).
Based on the results of the current research, according to the slope and speed variables, it seems that the speed variable could be considered as a more important factor for untoward oscillations in people with pronate foot than inclination variable.