Increase of expiratory resistance by the PEEP-valve of the servoventilator.
D000403:Airway Resistance; D006801:Humans; D007385:Intermittent Positive-Pressure Ventilation / Q000295:instrumentation*; D011175:Positive-Pressure Respiration / Q000295:instrumentation*; D012121:Respiration, Artificial / Q000379:methods