Fig. 1

The results of respiratory physiological examination of respiratory function during the fibrotic phase of bleomycin-induced lung injury. a Inspiratory capacity (IC). b Total respiratory system resistance (Rs). There were no differences in Rs among the four groups (p = 0.51). c Static compliance (Cst). d Static elastance (Est). The BA and BH groups had lower IC and Cst and higher Est than the SA and SH groups; the BH group had significantly higher Cst and lower Est than the BA group. SA, saline administration and air inhalation, n = 6; SH, saline administration and hydrogen inhalation, n = 6; BA, bleomycin administration and air inhalation, n = 11; BH, bleomycin administration and hydrogen inhalation, n = 11. NS, not significant; *, p < 0.05; **, p < 0.01; error bars indicate 95% CI