Fig. 5— Comparison of the effect of a bronchodilator (BD; 200 µg salmeterol) measured by spirometry (% predicted forced expiratory volume in one second (FEV1) and mean forced expiratory flow between 25 and 75% of forced vital capacity (FEF25–75%)) and the forced oscillation technique (airway resistance (Rrs) and Rrs sd at low (L), medium (M) and high (H) frequencies) in asthmatic subjects (n = 40, ▪), control subjects given a BD (n = 16, ░) and control subjects given a placebo (n = 15, □). *: p<0.05, BD significantly increased FEV1 and FEF25–75%, and decreased Rrs at all frequencies in both control and asthmatic subjects. #: p<0.05, comparing asthmatic and control subjects administered BD, only Rrs sd decreased significantly more in asthmatics. Error bars indicate sem.