Despite transition period, maximal running shoes may still increase risk of injury -- ScienceDailyThe results showed there were no changes in running mechanics over time in either type of shoes. The study did show increased impact forces and loading rates in the maximal shoe, supporting results of the earlier study. There was no difference in those biomechanics after the transition to the maximal shoes. "The concern in the maximal shoes is that you have this mass you're repeatedly loading. How are you attenuating that?" Pollard said. "We also saw changes in ankle kinematics, or the angular movement in the joints. With the maximal shoes we saw prolonged eversion, which likely increases stress on the legs and could lead to injury."