Results 201 to 210 of about 5,935 (237)
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A modified forced oscillation technique for measurements of respiratory resistance
Journal of Applied Physiology, 1977We present a modification of forced oscillation technique for automated determination of total respiratory resistance during inspiration. The modifications consist of a computerized signal averaging and an optimization technique in the assessment of the resistance value.
H, Aronsson +5 more
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Two-point calibration procedure of the forced oscillation technique
Medical and Biological Engineering and Computing, 1997The forced oscillation technique is usually calibrated by loading the measuring device with a known impedance. A correction function is calculated, relating the measured and reference impedances at each frequency. However, this one point calibration procedure does not account for transducer asymmetry.
K N, Desager +2 more
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Is Forced Oscillation Technique Useful in the Diagnosis of Occupational Asthma?
Journal of Occupational and Environmental Medicine, 2005The aim of the study was to determine whether the forced oscillation technique (FOT), which does not require active cooperation, may be useful to assess bronchial responsiveness in patients with suspected occupational asthma (OA).Changes in resistances evaluated by FOT, and DeltaFEV1 measured during methacholine challenge test were compared in 77 ...
Alexis, Descatha +6 more
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Forced oscillation technique may identify severe asthma
The Journal of Allergy and Clinical Immunology: In Practice, 2019Background: Fixed airflow obstruction in severe asthma is usually assessed by spirometry. However, the role of the forced oscillation technique (FOT) in severe asthma is unknown. We hypothesised that FOT would be useful to diagnose severe asthma and discriminate it from non-severe asthma. Aims: In this cross-sectional study, we assessed the usefulness
Toshihiro, Shirai +7 more
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Optoelectronic frequency stabilization techniques in forced oscillators
2021Forced frequency stabilization techniques of self-injection locking (SIL) and self-phase locked loop (SPLL) have been demonstrated to be effective for phase noise reduction. In SIL scheme, a portion of the oscillator output is directly injected back to the oscillator after passing through a long delay while in SPLL, the delayed signal is used to ...
Li Zhang, Afshin S. Daryoush
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Measurement of total respiratory impedance in dogs by the forced oscillation technique
Veterinary Research Communications, 1993The resistance (Rrs) and reactance (Xrs) of the total respiratory system were determined at various frequencies in 14 healthy conscious beagle dogs. A pseudorandom noise pressure wave was produced at the nostrils of the animals by means of a loudspeaker adapted to the nose by a tightly fitting mask.
Clercx, Cécile +3 more
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A Fan-Based, Low-Frequent, Forced Oscillation Technique Apparatus
IEEE Transactions on Instrumentation and Measurement, 2014The forced oscillation technique (FOT) is a noninvasive method to characterize the respiratory impedance (Z). Z is defined as the frequency-dependent ratio between pressure and flow. The FOT determines Z by superimposing small amplitude (in the order of 0.1 kPa) pressure oscillations on the normal breathing.
Hannes Maes +3 more
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Measurement of total respiratory impedance in calves by the forced oscillation technique
Journal of Applied Physiology, 1988We have determined the resistance (Rrs) and the reactance (Xrs) of the total respiratory system in unsedated spontaneously breathing calves at various frequencies. A pseudorandom noise pressure wave was produced at the nostrils of the animals by means of a loudspeaker adapted to the nose by a tightly fitting mask. A Fourier analysis of the pressure in
Gustin, Pascal +5 more
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