Fig. 3

Effect of exercise training on lung structure in mice. The lung tissue structure of mice in blank group (A, bar = 500 μm; B, bar = 100 μm), model group (C, bar = 500 μm; D, bar = 100 μm) and exercise group (E, bar = 500 μm; F, bar = 100 μm) was observed, and the alveolar cross-sectional area of mice were compared in three randomly selected fields (G). The lung structures of MG and EG mice exhibited typical emphysema, compared to healthy mice. After exercise intervention, the alveolar size of EG mice did not show significant changes. CG, control group; MG, model group; EG, exercise group; CSA, cross-sectional area. Values represented the means ± SD. ^*P < 0.05