Effect of home-based exercise training on functional parameters. A) PImax: maximal inspiratory pressure; B) PEmax: maximal expiratory pressure; C) 6MWD: 6-min walk distance. The box contains the middle 50% of the data (interquartile range); the bold line inside the box indicates the median. The boxes were also marked with means with 95% confidence intervals represented by points and vertical lines. Time 1: measurements before intervention period; time 2: measurements after intervention period; time 3: measurements after observation period; Me*: median for the control group; M**: mean for the control group.