摘要
Inspiratory-muscle fatigue （IMF） may occur after long-duration or continuous short-duration exercise and may limit exercise performance. Daily athletics training is often intermittent, but it is unclear if intermittent running induces IMF. We investigated IMF after a maximal anaerobic running test （MART） and maximal intermittent graded exercise test. Nine female middle-distance （400 or 800 m） runners performed MART and maximal intermittent graded exercise tests. Maximal inspiratory pressure （MIP） was measured before and after each test using a portable autospirometer. There was no significant difference in mean MIPs before （105 ± 24 cm H2O） and after （104 ± 28 cm H2O） the MART （P = 0.95, effect size [ES] as partial η2 = 0.01）. Mean M IP after the maximal intermittent graded exercise test （97 ± 26 cm H2O） was lower than before exercise （105 ± 27 cm H2O） （P = 0.01, 1]2 = 0.83） Mean IMF was higher for the maximal intermittent graded exercise test （8.5 ± 4.2 cm H2O） than for the MART （0.8 ± 4.1 cm H2O） （P = 0.01, ES as Cohen＇s d = 1.88）. IMF occurs after relatively long-duration intermittent running exercise. Coaches may consider recommending inspiratory-muscle training or warm-up to reduce IMF resulting from relatively long-duration intermittent running exercise.
