High resolution display for variables in volume-displacement body plethysmography.

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Abstract
With the volume-displacement body plethysmograph, because the volume transducer cannot readily be reset to yield zero signal, small but significant signal components accompanying large, steady-state components cannot be amplified sufficiently to permit of high resolution in the resulting oscillogram. With the pressure plethysmograph, the transducer is readily reset to zero simply by venting the chamber to the atmosphere. A simple method is presented for performing on the volume signal from a volume-displacement plethysmograph the electrical analogue of venting the pressure plethysmograph. The general applicability of the method to similar problems that complicate the use of other instruments is discussed.

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