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A comparison of linear and non-linear characterizations of impedance spirometry data

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Abstract

A comparison is made of the linear and non-linear least squares characterizations of the relationship between the transthoracic impedance change (ΔZ) and the respired air volume (ΔV) with regard to electrode location, somatotype, body position and type of breathing for seven normal, male, human subjects. The electrode locations which provided the largest ΔZ signal and those which produced the least error in the values of ΔV as determined from the measured values of ΔZ were also studied.

Sommaire

On fait une comparison des caractéristiques linéaires et non-linéaires par la méthode des moindres carrés des relations entre les variations d'impédance transthoracique (ΔZ) et le volume d'air respiré (ΔV) en tenant compte de la position des électrodes, du somatotype, de la position du corps et du type de respiration sur sept sujets humains normaux. Les positions des électrodes qui fournissent le plus grand ΔZ et celles qui produisent l'erreur moindre dans les valeurs de ΔV, déterminées d'après les valeurs mésurées de ΔZ, sont aussi étudiées.

Zusammenfassung

Ein Vergleich wird angestellt zwischen der linearen und der nichtlinearen Darstellung (Methode der kleinsten Fehlerquadrate) der Beziehung zwischen der transthorakalen Impedanzänderung ΔZ und dem Atemvolumen ΔV bezüglich Elektrodenlokalisation, Somatotyp, Körperlage und Atemtyp bei sieben normalen männlichen Versuchspersonen. Die Elektrodenlokalisationen wurden untersucht, welche das größte ΔZ-Signal ergaben, und die jenigen, welche nach Ausrechnung aus den gemessenen ΔZ-Werten den kleinsten Fehler in den ΔV-Werten ergaben.

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Authors and Affiliations

  1. Department of Physiology, Baylor University College of Medicine, Houston, Texas

    L. E. Baker, L. A. Geddes & H. E. Hoff

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  1. L. E. Baker
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  2. L. A. Geddes
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  3. H. E. Hoff
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Supported by the Biophysics Development Fund, Dept. of Physiology.

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Baker, L.E., Geddes, L.A. & Hoff, H.E. A comparison of linear and non-linear characterizations of impedance spirometry data. Med. & biol. Engng. 4, 371–379 (1966). https://doi.org/10.1007/BF02476155

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  • DOI: https://doi.org/10.1007/BF02476155

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