tokens: MEASUREMENTS AND MAIN RESULTS : Lung elastance ( EL ) and resistance ( RL ) were calculated from measurements of airway pressure , esophageal pressure , and airway flow in five anesthetized , paralyzed dogs during sinusoidal forcing at a constant mean airway pressure of 10 cmH2O in a wide range of breathing frequencies ( 0 . 2 to 1 . 0 Hz in intervals of 0 . 2 ) and tidal volumes ( 50 , 100 , 200 , and to 300 mL ) .