Mechanisms of sibilant noise formation observed during forced exhalation of a healthy person

Коренбаум, В. И.; Rasskazova, M. A.; Почекутова, И. А.; Fershalov, Yu. Ya.

doi:10.1134/s1063771009040095

Cited by 17 publications

(10 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This hypothesis is con sistent with the results of acoustic and biomechanical simulating the mechanisms and areas during FE [10]. This suggests, in particular, the possibility of wheezing formation in the middle and high frequency bands due to vortex shedding and dynamic flutter, respec tively.…”

Section: Discussionsupporting

confidence: 55%

Influence of modified gas mixtures on the acoustic parameters of human forced exhalation

et al. 2012

Self Cite

View full text Add to dashboard Cite

It was earlier demonstrated that the duration of tracheal noises of forced exhalation (FE) looks to be promising to determine adverse changes in the lung function after a dive. This study dealt with the param eters of tracheal expiratory noises (FE) as dependent of the composition of breathing gas mixtures. In the first type of experiments, 25 volunteers aged from 22 to 60 years carried out forced exhalation under a normal pres sure of air or of an oxygen-helium or oxygen-krypton mixture. In the second type of experiments, six vol unteers from 25 to 46 years of age performed forced exhalation with air in an altitude chamber under a normal pressure (0.1 MPa); the same subjects performed FE under an elevated pressure (0.263 MPa) while breathing air or an oxygen-helium mixture. In the first type of experiments, the total duration of tracheal FE noises in the frequency range 200-2000 Hz and 200 Hz bands FE noises depended directly and linearly on the density of the gas mixture; this was not the case in the high frequency band from 1400 to 2000 Hz. In the second type of experiments, the high frequency durations and spectral energies of tracheal FE noises (1600-2000 Hz) depended inversely and significantly on the adiabatic gas compressibility. In a simulated dive to a depth of 16.3 m (0.263 MPa), individual changes in the total duration of tracheal FE noises exceeded the diagnostic threshold of deterioration of the lung function in divers that was determined earlier under normal pressure.

show abstract

Section: Discussionsupporting

confidence: 55%

Influence of modified gas mixtures on the acoustic parameters of human forced exhalation

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…When breathing the same gas composition, an increase in aerodynamic resistance can be caused only by a decrease of lumen in the airways of respiratory tract. The decrease of airway lumen under FE is mechanically predicted in the range of bronchial tree levels between trachea and the seventh branching generation in accordance with estimations ( Korenbaum et al, 2009 ).…”

Section: Discussionsupporting

confidence: 77%

“…Thus, we may mechanically speculate that the revealed dominant response of FETa elongation to the HDT test can be considered as a sign of the swelling phenomena in the walls, not only in upper, but also in the more distal airways. It is the effect that actually should be followed by an increase of aerodynamic resistance under FE in the mentioned levels of bronchial tree ( Korenbaum et al, 2009 ).…”

Section: Discussionmentioning

confidence: 99%

A Technique of Forced Expiratory Noise Time Evaluation Provides Distinguishing Human Pulmonary Ventilation Dynamics During Long-Term Head-Down and Head-Up Tilt Bed Rest Tests Simulating Micro and Lunar Gravity

et al. 2018

View full text Add to dashboard Cite

Estimating the effect of microgravity/hypogravity on pulmonary ventilation function remains topical. Recently developed acoustic techniques based on the evaluation of the forced expiratory noise time (FETa) were hypothesized to be a promising tool for this aim. The aim of the protocol is to study the effect of two different modalities of bed rest space simulations (microgravity and lunar gravity) on FETa and spirometric indices. The FETa in the frequency band of 200–2000 Hz, recorded above human trachea, was evaluated. The 21st-day exposure to 6 degree head-down tilt (HDT) bed rest, simulating microgravity, and 9.6 degree head-up tilt (HUT) bed rest with head-zero tilt (HZT) rest intervals (HUT + HZT), simulating lunar gravity, in statistically identical subgroups of five and six healthy male volunteers, was studied. In the course of HDT bed rest, a significant elongation of FETa was found in relation to background measurements in “sitting” position (p = 0.016). The effect corresponded to a significant decrease of basic spirometric indices (p < 0.02). Moreover, FETa provided reliable discrimination of HDT and HUT + HZT bed rest tests (p = 0.018), while spirometric indices did not (p > 0.05). Based on previously found correlations (Korenbaum and Pochekutova, 2008; Malaeva et al., 2017), a FETa elongation in response to HDT bed rest was attributed to an increase of aerodynamic resistance of the respiratory tract. The technique seems promising to monitor human pulmonary ventilation dynamics in long-term space missions; however, new studies are welcome to verify it in real spaceflight.

show abstract

“…To improve the efficiency of the nozzle box is planned to conduct experimental research on the stand for a single nozzle [5], as well as involve in research methods used in other fields of science, in particular -medicine [6].…”

Section: Discussionmentioning

confidence: 99%

The Design of the Nozzle for the Nozzle Box Microturbines

Fershalov

et al. 2015

AMM

View full text Add to dashboard Cite

show abstract

Mechanisms of sibilant noise formation observed during forced exhalation of a healthy person

Cited by 17 publications

References 13 publications

Influence of modified gas mixtures on the acoustic parameters of human forced exhalation

Influence of modified gas mixtures on the acoustic parameters of human forced exhalation

A Technique of Forced Expiratory Noise Time Evaluation Provides Distinguishing Human Pulmonary Ventilation Dynamics During Long-Term Head-Down and Head-Up Tilt Bed Rest Tests Simulating Micro and Lunar Gravity

The Design of the Nozzle for the Nozzle Box Microturbines

Contact Info

Product

Resources

About