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An apparatus for the measurement of cough was devised. It consisted of a volume displacement body plethysmograph, Krogh spirometer, hot wire flow meter, and transducer for the esophageal pressure. A slower response of the volume displacement body plethysmograph than the pressure plethysmograph was compensated by “pressure correction” as suggested by previous authors. A semi-conductor transducer was used to measure pressure changes in the box. A mixing circuit of the output signal from the plethysmograph with that from the pressure transducer of the box was easily built since both signals were direct current.Simultaneous measurements of VBOX and VATPS showed new aerodynamic aspects in expirations. VBOX represented volume changes of a subject in the box while VATPS actually expired air from the mouth. A disagreement of VBOX and VATPS meant at least in part the intrathoracic compression of the air and pulmonary structures.As previously reported, a cough movent was divided into three phases. These were the inspiratory, minimum flow, and expiratory phase. The minimum flow phase corresponded to the period when the glottis was tightly closed. The intrathoracic compression was most manifest during this phase. Favourable effects of this compression on the cough mechanism were suggested from analyses of the data.

Plethysmographic Observations on Intrathoracic Compression during Cough