Figure 1. Data regarding breathing pattern variables at rest and during the four breathing exercises. Data are presented as the mean (X) and standard deviation. Vcw: chest wall volume; f: respiratory frequency;V• E: minute ventilation. * p<0.005 for rest × breathing exercises; † p<0.005 for diaphragmatic breathing × inspiratory sighs, SMI and intercostal exercise; ‡ p<0.005 for inspiratory sighs × SMI and intercostal exercise; § p<0.005 for SMI × intercostal exercise.
