Cardiorespiratory response of the Incremental Step Test in people with Chronic Obstructive Pulmonary Disease

Cardoso, Ana Leonor Paulino dos Santos

http://hdl.handle.net/10400.22/29648

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Authors

Cardoso, Ana Leonor Paulino dos Santos

Advisor(s)

Montes, António

Vilarinho, Rui

Rodrigues, Fátima

Abstract(s)

Incremental Step Test (IST) is a deasible and inexpensive alternative to assess exercise capacity in people with Chronic Obstructive Pulmonary Disease (COPD) and valid when compared to other field tests, as the Incremental Shuttle Walk Test. However, it is necessary to compare the maximal cardiorespiratory responde, through direct VO2 peak measurement, during IST in comparison with Cardiopulmonary Exercise Testing (CPET). Assess the cardiorespiratory response in IST and compare it with CPET in people with COPD. A cross-sectional analytical observational study was conducte in adults with stable COPD, from Hospital Pulido Valente, they performed the CPET, followed by the IST twice within one week. VO2 peak, CO2, VE, RER, HR, Bf and SpO2 were monitored with a portable gas analysis system. Dyspnea and leg fatigue were assessed with Modified Borg Scale (mBorg) and performance was also assessed. Paired t-tests (parametric measures), Wilcoxon signed-rank sum tests (non-parametric measures) and Pearson (normal variables), Spearman (non-normal variables) correlation coefficients were used to evaluate within-group diferences between tests. Twenty participants with COPD (67.8±8.62 years; 12 men; FEV1=56.34±15.52%) were eligible. At peak effort, V02, VE, Bf, HR, and dyspnea were similar between tests. V02 peak values and performance between tests were strongly correlated (r=0.800, p˂0.001 and p=0.816, p˂0.001, respectively). IST revealed a similar peak physiological response to CPET, suggesting that it should be considered as a maximal and symptom-limited test in people with COPD.