
Keywords: حداکثر تهویه داوطلبانه; CF; cystic fibrosis; CPET; cardiopulmonary exercise test; FEV1; forced expiratory volume in 1â¯s; HR; heart rate; SpO2; oxygen saturations measured by pulse oximetry; VÌO2; oxygen uptake; VÌCO2; carbon dioxide elimination; VÌE; minute ventilation; VD;