That forced vital capacity was slightly decreased with no change in forced expiratory volume in one second after the treadmill marathon is in accordance with previous research (Coast et al., 1999; Farrell, Maron, Hamilton, Maksud, & Foster, 1983). Although the decrease in forced vital capacity did not reach significance (P ¼0.06), the amplitude of the reduction (270 ml) is similar to that observed after 2.5 h of treadmill running at 70%
(Farrell et al., 1983). This suggests that the inspiratory muscle fatigue prevents participants from achieving full lung inflation post-exercise.
_ VO
2max