Differences in static footstep after a marathon

background: Marathon is a sport that had a boom in recent years. However, there are few biomechanical studies on footsteps, which could promote running efficiency and injuries prevention. Purpose: To determine the effects of marathon races on plantar pressure before and after a marathon race and to determine the relationship between age and plantar pressure before and after a marathon. Methods: We selected 15 runners who participated in Madrid's Marathon 2014. After medical examination and explanation of the inclusion criteria to all participants, barefoot pressures in a static and standing position was measured on a pressure platform before and just at the end of the marathon. Measurements were taken with participants being completely barefoot and using a pressure platform. Results: After marathon, athletes showed a decrease in the total area of support of footsteps both in the right and left feet (p =.02 y p <.001; respectively). The total mean pressure of left foot was increased just at the end of the race (p =.02). The age was negatively associated with the surface of front part in left foot (r = -.55, p =.04), with the percentage of the force of the front part of the left foot (r = -.52, p =.05) and with the forces distribution of the front part in the right foot (r = -.53, p =.05). Conclusions: Running a marathon and age seems to be affecting the race pattern, as well as footsteps. This fact could be caused by fatigue and the slower race velocity of older runners.