Effect of changes in lung volume on acoustic transmission through the human respiratory system

Item Type:	Article
Title:	Effect of changes in lung volume on acoustic transmission through the human respiratory system
Creators Name:	Pohlmann, A. and Sehati, S. and Young, D.
Abstract:	The variation of acoustic attenuation with lung density was determined in experimental studies on seven healthy human volunteers, using a change of lung volume as a means of varying lung density. White noise between 50 and 680 Hz was introduced into the mouth and the transmitted signals were recorded with four microphones on the posterior chest wall (left/right, top/base) at 24, 40, 60 and 80% of total lung capacity. The change in lung volume had a frequency-dependent effect on acoustic attenuation in all subjects. A frequency between 177 and 243 Hz was identified, where altering the lung volume between 24 and 80% of total lung capacity induced a change in attenuation of only 1.0 (+/-0.5) to 2.7 (+/-1.8) dB, while at a frequency of 364-436 Hz marked variations in attenuation 8.9 (+/-2.0) to 21.5 (+/-4.8) dB occurred with similar lung volume changes.
Keywords:	Acoustics, Acoustic Transmission, Human Lung, Lung Volume Dependence, Respiratory Sounds, Sound
Source:	Physiological Measurement
ISSN:	0967-3334
Publisher:	IOP Publishing Ltd
Volume:	22
Number:	1
Page Range:	233-243
Date:	February 2001
Official Publication:	https://doi.org/10.1088/0967-3334/22/1/326
PubMed:	View item in PubMed

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