INTRODUCTION: Patients with Chronic Obstructive Pulmonary Disease (COPD) have reduced functional capacity, becoming indispensable to their evaluation through functional physical tests. OBJECTIVE: To compare the peripheral oxygen saturation (SpO2), dyspnea and fatigue of the lower limbs (LL), between the six-minute walk test in hallway (6MWT) and the of oval track (6MWToT), the six-minute step test (6MST) and the sit--to-stand test (STST), in patients with COPD; also verifying correlate and concordance of these variables between 6MWT and other tests. MATERIALS AND METHODS: Ten patients with COPD (72 ± 7 years, FEV1 < 80% predicted) were assessed using the functional tests. RESULTS: In the inter-tests analysis, there was no significant difference in SpO2 and in the change in dyspnea (Δdyspnea) and fatigue in the lower-limbs (ΔfatigueLL) between rest and exercise of peak (Δ). Significant correlation were observed, but no concordance between the lowest values of SpO2 in the 6MWT with lowest values of SpO2 in 6MWToT, 6MST and STST, and the mean of difference between the mean with standard deviation ± 1.96: 0.8 ± 3.5%, -1.9 ± 3.5% and -2.5 ± 4.6%, respectively; and between Δdyspnea and ΔfatigueLL in the 6MWT with the Δdyspnea and ΔfatigueLL in the 6MWToT: 0.0 ± 1.0 and 0.4 ± 0.8, respectively; and ΔfatigueLL in the 6MWT with ΔfatigueLL in the STST: 0.1 ± 1.1. CONCLUSION: The functional tests assess oxygenation and perceived effort responses similar in magnitude. However, according to the variables analyzed, weren't found correlation between the 6MWT with the 6MWToT, 6MST and STST, by the large variations in the limits of agreement and large interindividual variation, thereby the 6MWToT, 6MST and STST and doesn't replace the 6MWT.
Chronic Obstructive Pulmonary Disease; Exercise test; Dyspnea; Muscle fatigue; Exercise tolerance
