A total of 132 patients met the inclusion criteria and were enrolled into the studies. There were two patients lost to FU, and seven patients discontinued training and/or defaulted the 6M FU assessment. The data of one individual was excluded due to contamination of the assessment data. The ultimate number of patients for the analysis was 118: group I (HQG group), n = 51; group II (conventional PRP), n = 32; and group III (only medical treatment group), n = 35 ( Fig. 2). Analysis of the baseline characteristics supported the fact that the randomization procedure produced groups with comparable characteristics (Table 1). The average age of all participants was 62 years, and 72–80% of them were male. About half of them had their airflow limitation at GOLD stage I and half of them at GOLD stage II.