Journal of Applied Physiology
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J Appl Physiol 47: 169-174, 1979;
8750-7587/79 $5.00
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Journal of Applied Physiology, Vol 47, Issue 1 169-174, Copyright © 1979 by American Physiological Society

ARTICLES

Respiratory impedance and derived parameters in young children by forced random noise

S. P. Williams, J. M. Fullton, M. J. Tsai, R. L. Pimmel and A. M. Collier

The frequency dependence of total respiratory impedance during spontaneous breathing was measured repeatedly in 16 children (3--5 yr old) over a 3-mo period using forced random noise and spectral analysis. Total respiratory resistance, compliance, and inertance, which were calculated fromthe impedance data using regression analysis with a second-order model, had overall mean values +/- SD of 5.61 +/- 0.49 cmH2O.l-1.s, 403 +/- 1.04 ml.cmH2O-1, and 0.0120 +/- 0.0024 cmH2O.l-1.s2, respectively. Linear regression analysis showed that resistance and compliance correlated with either height or forced vital capacity with r values in the range 0.77--0.89. Analysis of measurement variability suggested that resistance measurements had, on the average, a coefficient of variation of 15%; corresponding values for compliance and inertance measurements were 25%.


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