title: [Acoustic and spirometric indices of forced expiration noise in the conditions of 5-day dry immersion].
abstract: Dynamic studies of forced expiration (FE) indices involved 7 normal males aged 21 to 25 participating in a 5-d experiment with dry immersion (DI). FE spirometry was conducted simultaneously with registration of tracheal noise with the help of a microphone. Indices included acoustic duration of tracheal noise (Ta), forced lung capacity (FLC), FE volume per a second (FEV1), peak expiratory rate (PER) and time to reach (T(PER)) before DI, on DI days 1 and 4, and next day after completion. PER showed a significant decrease by 8.4% on DI day-1 and rose by 8.9% on DI day-4, though remaining below pre-DI values. Throughout the experiment, FLC and FEV1 did not change on the average. There was a noticeable increase of Ta by 17 % after DI which may suggest strengthening of respiratory resistance and invites further investigation. A moderate negative correlation was stated between TA and the Gensler index (r = -0.63), whereas correlation with the other spirometric indices was weak or absent.
authors.forename: A N
authors.initials: AN
authors.lastname: Mikhaĭlovskaia
authors.forename: A A
authors.initials: AA
authors.lastname: Osipova
authors.forename: A I
authors.initials: AI
authors.lastname: D'iachenko
mesh_terms: D000162:Acoustics; D000328:Adult; D000337:Aerospace Medicine; D006801:Humans; D007101:Immersion; D008176:Lung Volume Measurements; D008297:Male; D015656:Respiratory Mechanics / Q000502:physiology*; D056152:Respiratory Rate / Q000502:physiology*; D012135:Respiratory Sounds / Q000502:physiology; D013026:Space Flight; D013147:Spirometry; D014893:Weightlessness / Q000009:adverse effects