Oral glutamine supplementation during and after exercise abolishes exercise-induced decreases in plasma glutamine concentration but does not affect secretory IgA (sIgA) salivary output. Whether chronic glutamine supplementation during high intensity interval training influences salivary and nasal sIgA concentration is unknown. PURPOSE: To examine the effects of chronic glutamine supplementation on sIgA during intense running training. METHODS: Runners (n= 13, body mass 69.9±2.8 kg, VO₂ peak 55.5±2 mL^.kg^-1min^-1, age 29.1±2.8 yr.) participated in twice-daily interval training for 9-9.5 days, followed by recovery (5-7 days). Oral glutamine supplement (0.1 g^.kg^-1) or placebo was given four times daily for the first 14 days. After an overnight fast, venous blood, nasal washes, and stimulated saliva were collected at baseline (T1), mid-training (T2), posttraining (T3), and after recovery (T4). Mood states were assessed using Profile of Mood States (POMS) inventories. RESULTS: Glutamine concentration in resting subjects decreased from T1 to T4 (p < .05) and was not altered by supplementation. Salivary IgA concentration and output were unchanged by training or supplementation. Mean nasal IgA across the study period was greater in runners receiving glutamine (264.7 ± 35.0 µg/mg protein) vs. placebo (172.4 ± 33.7 µg/mg protein, p<0.05). POMS analyses indicated that vigor was lower at T3 vs. T1 (p < 0.05) and fatigue was higher at T2 vs. T1 and T4 (p < 0.05). CONCLUSION: Chronic glutamine supplementation during interval training results in higher nasal IgA than placebo but does not affect salivary IgA concentration or output.