Frade MCM, et al. - Researchers analyzed 50 COPD patients to assess intra- and inter-rater reproducibility as well as to verify the criterion validity of the 6-min stationary walk test associated with virtual reality (STVR-6). Randomization was applied to the execution order of the tests; the STVR-6 was performed over 2 d, and the 6-min walk test was performed in 1 d. Via a gas analysis performed for both tests, they obtained 6-min walk distance variables and number of steps in the STVR-6. Findings revealed excellent intra-rater reproducibility and excellent to good inter-rater reproducibility of STVR-6. A learning impact and a requirement to perform at least 2 tests were shown by high values of error measures. Also, they found a high to moderate correlation between the STVR-6 and the 6-min walk test. Based on these findings, the reproducibility, as well as the validity of the STVR-6 for assessing the functional capacity of subjects with COPD, was confirmed.