Oscilometria De Impulso E Espirometria Em Escolares Submetidos Ao Teste De Caminhada De Seis Minutos

Abstract

Objective: To verify repercussions of submaximal exercise testing on respiratory mechanics and pulmonary function in schoolchildren.Methods: Cross-sectional study, with children aged 7 to 14 years, who had their respiratory mechanics assessed by impulse oscillometry (IOS), and pulmonary function by spirometry. They performed the six-minute walk test (6MWT), as per the standards by the American Thoracic Society. The 6MWT was performed twice with a 30-minute interval. IOS and spirometry were performed before the first 6MWT (Pre-6MWT) and immediately after the first (Post-6MWT1) and second walking tests (Post-6MWT2). The results in these three phases were compared by analysis of variance for repeated measures (post-hoc Bonferroni test) or by the Friedman’s test, with p≤0.05 considered significant.Results: Twenty-one subjects participated in the study: 53% were males and mean age was 10.9±2.3 years. There were differences between total resistance (R5) and central airway resistance (R20) at the three phases of assessment (p=0.025 and p=0.041, respectively). Post-hoc analysis indicated increase in R5 when Pre-6MWT and Post-6MWT1 were compared (R5=0.540±0.100 versus 0.590±0.150 kPa/L/s, p=0.013; and R20=0.440±0.800 versus 0.470±0.100 kPa/L/s, p=0.038). Forced expiratory flow 25-75% (FEF25-75%) changed over time (p=0.003).Conclusions: Repercussions were: increase in central and total airway resistance and reduction of FEF25-75% after 6MWT in schoolchildren, suggesting that greater attention should be given to submaximal tests in children with predisposition to airways alterations.

Effects of prehabilitation resistance training in mild to moderate clinically frail patients awaiting coronary artery bypass graft surgery

“…21 However, there is a contradiction in the findings of such a study that there was no significant variation observed in heart rate, oxygen saturation, and distance covered by 6MWT. 22…”

Clinical Applications of Impulse Oscillometry

“…Spirometry did not change, but there was a decrease in the FEF 25-75%. The importance of this study is that it suggests that greater attention should be given to submaximal test particularly in children who are predisposed to airway alterations [17].…”