We have measured the inhalation profiles of asthmatic children [ CHILD ; n = 16 , mean forced expiratory volume in 1sec ( FEV1 ) 79 % predicted ] , asthmatic adults ( ADULT ; n = 53 , mean predicted FEV1 72 % ) , and chronic obstructive pulmonary disease ( COPD ; n = 29 , mean predicted FEV1 42 % ) patients when they inhaled through an Aerolizer , Diskus , Turbuhaler , and Easyhaler using their `` real-life '' DPI inhalation technique .