
Keywords: مقاومت تنفسی; FVC; forced vital capacity; FEV1; forced expiratory volume in 1 second; FEF25-75; mean forced expiratory flow between 25% and 75% of the FVC; V'50; maximal expiratory flow at 50% of vital capacity; V'25; maximal expiratory flow at 25% of vital capacit