“…The trials have lasted from a few weeks, in patients hospitalized for routine assessment or acute exacerbations, up to 3 years in children [15,16,17,18,19,20,21,22,23,24]. The results in some of these studies have shown an increase both in maximal oxygen uptake and anaerobic performance after the training period [15, 16, 19, 21,23,24,25]. Other studies have shown a slower yearly decline in pulmonary function after physical training [20, 22].…”