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J Appl Physiol 47: 1127-1130, 1979;
8750-7587/79 $5.00
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Journal of Applied Physiology, Vol 47, Issue 5 1127-1130, Copyright © 1979 by American Physiological Society

ARTICLES

Volume-displacement body plethysmograph using a large flowmeter without pressure compensation

P. M. Griffin and N. Zamel

A modification of the conventional volume-displacement whole-body plethysmograph was done using a low-resistance flow element and integrating the plethysmographic pressure signal. A flow element with a resistance of 0.036 cmH2O/(l/s), linear to 75 l/s was fitted to a 440-liter plethysmograph, resulting in an instrument with a volume-amplitude-frequency response flat to 15 Hz and in phase with mouth flow and esophageal catheter-balloon to at least 15 Hz without pressure compensation.




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