Figure 2

Alveolar air spaces measured by mean linear intercept in mice exposed to cigarette smoke (CS) or fresh air (FA) and put through 4 weeks of interval training (IT) or kept sedentary for 4 weeks (Se). Bars indicate mean ± SD. Higher bars represent more severe emphysema. *p = 0.026 (main effect of CS vs FA, 2-way ANOVA without interaction term).