Journal of Applied Physiology AJP: Advances in Physiology Education
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J Appl Physiol 63: 1853-1861, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 63, Issue 5 1853-1861, Copyright © 1987 by American Physiological Society

ARTICLES

Comparison of calibration methods for respiratory inductive plethysmography in infants

M. D. Revow, S. J. England, H. A. Stogryn and D. L. Wilkes
Institute of Biomedical Engineering, University of Toronto, Ontario, Canada.

In infants under the age of 6 mo respiratory inductive plethysmograph (RIP)-calculated tidal volumes (VT) were compared with simultaneously measured volumes using a pneumotachograph (PNT) to 1) assess whether using multiple points (MP) along the inspiratory profile of a breath is superior to using only VT when calculating volume-motion (VM) coefficients, 2) verify the assumption of independent contributions of the abdomen and rib cage to VT, which was accomplished by extending the normal RIP model to include a term representing interaction between these two compartments, and 3) investigate whether VM coefficients are sleep-state dependent. Neither use of multiple points nor inclusion of the interacting term improved the performance of the RIP over that observed using a simple two-compartment model with VT measurements. However, VM coefficients obtained during quiet sleep (QS) were not reliable when used during rapid-eye-movement (REM) sleep, suggesting that coefficients obtained during one sleep state may not be applicable to another state where there is a substantial change in the relative abdominal/rib cage contributions to VT.


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