Spirometry was done for all patients before each supervised training session. The measured FEV1% pred. were compared throughout the 12-week program using the one way analysis of variance (one way ANOVA) test followed by multiple comparison POST-HOC Benferroni method. There was a significant difference between all sessions regarding the pre-training FEV1% pred. being increasing sequentially from the first to the last training week (F = 19.211, p = 0.000). The change of FEV1% pred. over the 12-week program time is presented in Fig. 1.