Fig. 2
Active force generated by bronchial rings after 3 consecutive stretches at a frequency of 0.25 Hz and strain amplitude of 46% that matched the airway strain observed in intact lungs during a DI. The oscillatory strain was applied just before time zero. *P < 0.05 and **P < 0.01 indicate statistical difference from the maximum isometric force before oscillation (Fmax). Reproduced from Dong et al. [24] with permission