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- W2040751010 abstract "Static and dynamic spirometric tests were performed in 21 healthy subjects (21-61 years old, 8 smokers and 9 ex-smokers) on 3 different days within 2 weeks. The design of the study allowed separation of the influence of learning and diurnal changes between 09.00 and 17.00 h. In addition, the reproducibility of the tests and the effect of inhalation of 2.5 mg of terbutaline sulphate were studied. No learning effect was observed. There were slight, but statistically significant differences between morning, noon and afternoon measurements. Thus, the residual volume and flow in the early phase of forced expiration were highest in the afternoon, while maximal voluntary ventilation was lower at noon than in the afternoon or morning. The intraindividual variabilities (defined as standard deviation of difference between first and second measurement) of total lung capacity, vital capacity and forced expiratory volume in 1 s (FEV1) were about 3% of the predicted values. The ratio of intra- to interindividual variability was 0.2-0.3. The remaining tests showed higher variability and a higher intra- to interindividual variability ratio. Terbutaline inhalation caused a significant increase in most forced expiratory flow variables. A 10% increase in FEV1 corresponded to a 50-60% increase in endexpiratory flow. In spite of this, the endexpiratory flow and mean transit time were better discriminators of the effects of bronchodilation in normal subjects." @default.
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- W2040751010 date "1987-01-01" @default.
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- W2040751010 title "Learning Effects, Variation during Office Hours and Reproducibility of Static and Dynamic Spirometry" @default.
- W2040751010 doi "https://doi.org/10.1159/000195204" @default.
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