Results 261 to 270 of about 63,238 (298)
Some of the next articles are maybe not open access.
Measurement of respiratory system impedances.
2002Forced oscillation technique (FOT) is a simple and minimally invasive method used to study the mechanical properties of the respiratory system by measuring its response to an externally applied forcing signal (see chapters 12 and 29). This mechanical response is studied by means of the impedance, defined as the complex ratio between the applied ...
openaire +3 more sources
Active impedance of respiratory system in anesthetized cats
Journal of Applied Physiology, 1982We have assessed the validity of the method of Siafakas et al. (J. Appl. Physiol.: Respirat. Environ. Exercise Physiol. 51: 10913;121, 1981) for determining active elastance (E'rs) and flow resistance (R'rs) of the respiratory system. In six cats anesthetized with pentobarbital sodium we have measured flow, volume, and tracheal occlusion pressure ...
W A, Zin, L D, Pengelly, J, Milic-Emili
openaire +2 more sources
Analysis of Respiratory Impedance Characteristics in Chronic Bronchitis
Respiration, 1992Impedance measurements of the respiratory system were performed by means of the technique of forced oscillations to study the mechanical characteristics of the respiratory system in 33 patients with chronic bronchitis without spirometric evidence of airway obstruction (FEV1 greater than or equal to 70% predicted).
G J, Wesseling, E F, Wouters
openaire +2 more sources
Do Current Sports Brassiere Designs Impede Respiratory Function?
Medicine & Science in Sports & Exercise, 2005Although sports brassieres are more effective in limiting breast motion and related breast pain when compared with standard fashion brassieres, some females do not wear sports brassieres during physical activity, as they perceive them to be too tight around the torso, possibly impeding their performance during physical activity.
Steele, Julie R +2 more
openaire +3 more sources
Decylubiquinol impedes mitochondrial respiratory chain complex I activity
Molecular and Cellular Biochemistry, 2008We have studied the interaction of decylubiquinone, an effective substrate for respiratory chain complexes III and II, with complex I in mouse and human tissues. We found that its reduced form, decylubiquinol, severely impedes complex I activity, while the oxidized form, decylubiquinone acts as a potent acceptor for complex I electrons.
Paule, Bénit +2 more
openaire +2 more sources
Instrumentation for Measuring Respiratory Impedance by Forced Oscillations
IEEE Transactions on Biomedical Engineering, 1977Recent reports have suggested that the frequency dependence of the respiratory impedance may provide a sensitive method for characterizing early changes in pulmonary mechanics. A modification of the forced-oscillation technique provides an experimental method for obtaining the necessary data. A loudspeaker was used to provide the pressure oscillations,
R L, Pimmel +5 more
openaire +2 more sources
Effects of respiratory gas composition on transthoracic impedance
Resuscitation, 1998The transthoracic current generated during defibrillation comprises a cardiac and extracardiac component. Changes in impedance of transthoracic pathways will alter the transmyocardial current and may thus affect the outcome from defibrillation. The lungs comprise a large component of extracardiac tissue but the effects of different respiratory gases on
Deakin, C.D. +5 more
openaire +3 more sources
Total respiratory input and transfer impedances in humans
Journal of Applied Physiology, 1985Total respiratory input (Zrs,in) and transfer (Zrs,tr) impedances were obtained from 4 to 30 Hz in 10 healthy males by simultaneously measuring mouth and chest flow while applying pseudo-random pressure variations at the mouth. Compared with Zrs,in, the real part of Zrs,tr was larger up to 10 Hz but exhibited a much stronger negative frequency ...
R, Peslin, C, Duvivier, C, Gallina
openaire +2 more sources
An improved forced oscillatory estimation of respiratory impedance
International Journal of Bio-Medical Computing, 1982A new scheme of estimation is proposed for the determination of the total respiratory impedance (Zr) by forced oscillations. Instead of estimating Zr from the airflow at the mouth and the pressure drop across the respiratory system, Zr can be estimated from cross-power spectra between the electrical signal of the driving apparatus and the measured ...
B, Daróczy, Z, Hantos
openaire +2 more sources
Measurement of low-frequency respiratory impedance in infants.
American Journal of Respiratory and Critical Care Medicine, 1996Low-frequency respiratory impedance (Zrs) data permit the separate estimation of the mechanical properties of the airways and the tissues, but they are difficult to collect in humans because of the need for apneic conditions. We exploited the apneic phase produced by invoking the Hering-Breuer reflex with end-inspiratory airway occlusion in five ...
Sly Peter D. +3 more
openaire +3 more sources