Oscillation Mechanics of Lungs and Chest in Man

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Abstract
The chest was driven by an oscillating air pump which generated sinusoidal pressure waves at the mouth or around the body and the over-all impedance of the chest was measured by a pressure gauge and flowmeter at frequencies from 2 to 15 cps. The frequency response characteristics of the chest wall were measured with velocity transducers and indicated probable resonant frequencies of 7 to 15 cps. The frequency response characteristics of the diaphragm and abdomen were indirectly deduced from measuring velocity of the abdominal surface and headward-footward velocity of the body with respect to the table. The airways can probably be characterized as a resistance-capacitance system leading to the chest wall and diaphragm, which may be represented as visco-elastic massive surfaces exhibiting both perpendicular and transverse surface waves in response to the driving transthoracic pressure waves.

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