[Mechanical impedance of the chest in smokers and non-smokers (author's transl)]

Bull Eur Physiopathol Respir. Jan-Feb 1981;17(1):93-105.
[Article in French]


Mechanical impedance of the respiratory system was measured at 5, 10, 15 and 20 Hz in 47 healthy non-smokers, 20 ex-smokers and 51 current smokers. Besides the resistance and its frequency dependence, the compliance, the inertance and the resonant frequency of the respiratory system were computed using the assumption of a second order linear system. The data were normalized for sex, age and body height on the basis of correlations observed in non-smokers. No significant difference was found in ex-smokers. In smokers the resistance was significantly increased at all frequencies. However, it was normal in a number of subjects with abnormally low maximal expiratory flows. unlike maximal flows, forced oscillations indices were not correlated to tobacco consumption expressed in pack-years. The results do not indicate that impedance measurements breathing air may be specially useful for early detection of airway abnormalities.

Publication types

  • English Abstract
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Female
  • Forced Expiratory Volume
  • Humans
  • Lung / physiology*
  • Lung / physiopathology
  • Lung Compliance
  • Male
  • Maximal Midexpiratory Flow Rate
  • Plethysmography, Impedance
  • Smoking*