In asthmatic subjects , postintervention ( i.e. , preexercise ) forced expiratory volume 1.0 s was significantly different among the four exercise trials ( CON = 3.5 0.4 , BD = 4.1 0.4 , SHAM = 3.6 0.3 , BC = 2.8 0.3 L , P < 0.05 ) , whereas it was not different in control subjects .