In the two treatment groups , pulmonary functional parameters , forced vital capacity ( FVC ) , forced expiratory volume in @ second ( FEV@ ) , maximal voluntary ventilation ( MVV ) , peak expiratory flow ( PEF ) , forced expiratory flow at @ % of forced vital capacity ( FEF@ ) , forced expiratory flow at @ % of forced vital capacity ( FEF@ ) , and forced expiratory flow at @ % of forced vital capacity ( FEF@ ) were determined .