Source: Annual Congress 2010 - Exercise training: new groups, new methods and outcomes
Disease area: Airway diseases

Abstract

Recently we demonstrated that asthmatic children presented respiratory cost index (RCI) and respiratory effort cost index (RECI) higher than healthy children, suggesting that these indexes can be used for identifying respiratory muscle overload in different respiratory diseases during six-minute walking test (6MWT). OBJECTIVE: 1) To assess RCI and RECI in COPD patients, 2) To correlate these indexes with spirometric data. METHODS: 30 male (71.4±8.1 years) and 24 female (65.8±9.3 years) with moderate-severe COPD were evaluated. The RCI was estimated from the relation between variation in the initial and final respiratory rate (RR) and average speed achieved on the 6MWT [(RRf-RRi)/average speed, rpm/m/min]. The RECI was estimated from the maximal final score evaluated from the Borg scale and average speed achieved on the 6MWT (Bf/average speed). STATISTICAL ANALYSIS: Correlations were evaluated by the Spearman rank correlation test. RESULTS: CVF, FEV₁, FEV₁/FVC in male and female were, respectively (65.8±2.8% and 68.2±2.9%), (41.2±15.7 % and 50.6±14.7%), (45.9±11.5% and 56.4±9.3%). The RCI was 0.111±0.142 rpm/m/min in male and 0.107±0.138 rpm/m/min in female groups. The RECI was 0.060±0.006 in male and 0.093±0.011 female groups and correlated negatively with FEV₁ (-0.51, p=0.03 and -0.35, p=0.04) and FEV₁/FVC (-0.47, p=0.007 and -0.36, p=0.03). There was no correlation between RCI and spirometry parameters. CONCLUSION: These results show for the first time that RECI negatively correlated with pulmonary function and suggests that RECI was more sensitive than REC to identify respiratory muscle overload in COPD patients during the 6MWT.

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L. Orlandi, R. Maciel, F. Rocha, M. Ramos, M. D. G. Rodrigues-Machado (Belo Horizonte, Brazil). Respiratory effort cost index correlates negatively with pulmonary function test in COPD patients during six minute walking test. Eur Respir J 2010; 36: Suppl. 54, 4877

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