Document Classification

Section Type: METHODS

Text: Lung function tests, including vital capacity (VC), residual volume (RV), total body plethysmographic resistance (RT), specific body plethysmographic resistance (Rs), total body plethysmographic resistance at low inspiratory/expiratory flows (Rlo), forced expiratory volume in 1 s (FEV1), peak expiratory flow rate (PEF), peak inspiratory flow rate (PIF), maximum expiratory flow at 50 % VC (MEF50) and maximum inspiratory flow at 50 % VC (MIF50) were performed in 14 normal subjects with added external resistive loads (inner diameter of circular orifice : 15, 10, 8, 6 mm ; equivalent to surface areas of 177, 79, 50 and 28 mm2, respectively), applied in random order.