Journal of Applied Physiology, Vol 52, Issue 6 1530-1534, Copyright © 1982 by American Physiological Society
Forced noise mechanical parameters during inspiration and expiration
T. K. Miller and R. L. Pimmel
Using the forced random noise technique we collected three 5-min records of
pressure and flow signals in five clinically normal nonsmoking adults. Each
recording was analyzed to obtain respiratory impedance spectra from data
obtained during continuous sampling, midinspiration, and midexpiration.
Estimates of respiratory resistance, inertance, and compliance were
obtained by regression analysis on each impedance spectrum. Mean expiratory
resistance and compliance were significantly (P less than 0.01) greater
than corresponding mean inspiratory values, while mean expiratory inertance
was significantly (P less than 0.001) less than the mean inspiratory value.
Parameters from continuous sampling agreed fairly well with inspiratory
resistance and inertance and with expiratory compliance. The coefficient of
variation of parameters from continuous data were similar to, or smaller
than, those from inspiratory or expiratory data. Thus continuous sampling
appears to be an acceptable approach for collecting random noise data.
