while Chevrolet et al. (1993) observed a 25% reduction in maximal inspiratory pressure measured 15 min following a marathon run. We also observed a significant reduction (23%) in peak inspiratory flow following the marathon, which is indicative of a reduction in the maximal flow-generating capacity of the inspiratory muscles (McCool, Hershenson, Tzelepis, Kikuchi, & Leith, 1992; Romer et al., 2002). This failure to maintain the capacity to generate both force and flow provides strong evidence that inspiratory muscle fatigue occurs following marathon running.