Individualized Aerobic and High Intensity Training for Asthmatic Children (3)
The maximum expiratory flow-volume curves were performed on a digital spirometer (Datalink pulmochart). The lung function study included FVC, FEV,, maximal expiratory flow at 50 percent of FVC, and forced expiratory flow between 25 and 75 percent of FVC. The following values were then calculated: FEV,/FVC and FEF25-75/FVC. The predicted values were those of Zapletal et al for MEF50%FVC and Dickman et al for FVC, FEV„ and FEF25-75. The exercise test was performed on an electrically-braked cycle ergometer (Gauthier). buy birth control online
Subjects breathed through a low resistance valve (Hans Rudolph, dead space=90 ml). Inspiratory airflow was measured during exercise with a pneumotachograph (Fleich No. 3) and a pressure transducer (Validyne) with a measuring range of ±2 cm H20. The pneumotachograph was placed on the inspiratory tubing in order to avoid problems due to water vapor. Calibration of the flow module was accomplished by introducing a calibrated volume of air at several flow rates. Expired gases were sampled in a mixing chamber (5 L) and analyzed for 02 with a polarographic analyzer (Beckman OM II) and for C02 with an infrared analyzer (Cosma diamant 6000).