G. Charbonneau

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An accurate recording system was set up and used for analyzing normal and asthmatic breath-sound features. Breath sounds are recorded at the trachea simultaneously with the airflow signal at 0.5- and 1-1/s levels. The study was carried out in the frequency domain using a fast-fourier transform (FFT). FFTs are taken on 1,024-sample blocks (one block = 200(More)
The effects of stress on risk assessment behavior in mice were studied by examining latency to emerge from a safe compartment into a large, well-lit open field. In the first experiment different groups of mice were exposed for 1 h to tube restraint, fixed interval 2-min foot shock, or attack by an aggressive conspecific. Nonstressed controls were left(More)
We simultaneously recorded tracheal sound and air flow from nine normal subjects (seven males and two females). Sound was picked up at the supra sternal notch with an air-coupled sensitive microphone held in a small airtight probe. Flow was measured at the mouth using a pneumotachograph Fleisch n degrees 2. Both sound and flow were directly digitized at a(More)
OBJECTIVES The aim of this study was to provide analytical overviews of anthropometric measurements and their relationships with type 2 diabetes and cardiovascular disease (CVD) risk factors within the Inuit population, given that few studies have focused on this issue. Study design. Cross-sectional study. METHODS Anthropometric and biological data were(More)
Respiratory sounds are composed of various events: normal and so-called adventitious sounds. These phenomena present a wide range of characteristics which make difficult their analysis with a single technique. Adapted time-frequency and time-scale techniques allow to fit best, under constraints, the accuracy of analysis of a time segmentation and, by the(More)
The flow rate curve takes different shapes during forced expirations performed by normal subjects. In some cases a wheeze may exist. In this study, we examine the conditions for appearance of a wheeze, before and after the peak flow, and the relationship between the wheeze and the shape of the flow rate curve. We analyzed ten parameters in 83 forced(More)
We recorded the lung sound and flow rate from six normal subjects (3 male and 3 female). Sound was picked up at the trachea with a sensitive microphone held in a small probe. Flow rate was measured at the mouth using a Fleisch No. 3 pneumotachograph. Subjects were made to breath for 15 s, with an increasing peak flow rate starting from apnoea to around 2(More)
Wheezes are abnormal sounds which are known to be relevant to Chronic Obstructive Pulmonary Diseases (COPD). The analysis of such signals is especially useful in patient monitoring or pharmacology. Respiratory sounds are dependent on the flow and the volume. Furthermore, they can be the result of a complex mixture of events. The analysis of lung sounds can(More)
We define here tonal melodies and spectral melodies: For sounds containing only octaves, the former correspond to fundamental frequency variations and the latter to spectral envelope variations. In this paper we give statistical results of judgements showing that tonal melodies are better perceived by the right ear. Conversely the left ear is more able to(More)
Prior studies have shown that laryngotracheal sounds are vectors of objective information which indicate the origins and mechanisms of sound production. The first objective of this study is to confirm these earlier findings on a larger scale. The second objective is to develop a simple apparatus which permits the rapid acquisition and analysis of(More)