Values of exhaled nitric oxide. * indicates significant effect of LPS in increasing exhaled nitric oxide (P <0.001). # indicates significant effect of exercise in attenuating the effect of LPS on exhaled nitric oxide (P = 0.01). CTR (control): instilled with saline and untrained; Exe (exercise): instilled with saline and trained; LPS: instilled with LPS and untrained; Exe+LPS: instilled with LPS and trained. LPS, lipopolysaccharide.