Key result
The 6-minute step test shows excellent test-retest reliability and correlates with the 6MWT in CAD.
Why the study?
The validity and reliability of the 6-min step test (6MST) had not been assessed in individuals with coronary artery disease.
Is the 6-min step test a valid and reliable measure of functional capacity compared to the 6-min walk test in patients with coronary artery disease?
RCT (n=35)
Randomized crossover
Is the 6-min step test a valid and reliable measure of functional capacity compared to the 6-min walk test in patients with coronary artery disease?
Effect estimate: ICC 0.967 (95% CI 0.766-0.989)
p-value: p=<.05
The 6-minute step test is a valid and highly reliable tool for assessing functional capacity in patients with coronary artery disease, correlating well with the standard 6-minute walk test.
OBJECTIVE: To assess the validity and reliability of the 6-min step test (6MST) in individuals with coronary artery disease (CAD). METHODS: In a randomized and crossover design, 35 patients with CAD (65.8 ± 9.6 years), referred by a physician of a cardiology ambulatory, performed two 6MSTs and two 6-min walk tests (6MWTs) in order to assess reliability in patients with arterial coronary disease. The order of performance of the tests was established by a draw. RESULTS: 6MST test-retest reliability was excellent (intraclass correlation coefficient = 0.967; 95% CI: 0.766, 0.989; p < .05). There was an increase of 7.9 ± 8.2 steps from the first to the second 6MST, with a technical error of measurement = 8.0; p < .001. The correlations between distance walked in the 6MWT and number of steps in the 6MST in the first and second tests were 0.6 and 0.7 (p < .001), respectively. CONCLUSION: The 6MST is a reliable test to measure functional capacity in individuals with CAD. The test is valid when using 6MWT as the gold standard. There is an 88% chance of a subject classified in a given tertile by the 6MWT being in the same tertile in the 6MST.
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Travensolo et al. (2019) conducted an RCT in Coronary artery disease (n=35). 6-min step test (6MST) vs. 6-min walk test (6MWT) was evaluated on Test-retest reliability (ICC 0.967, 95% CI 0.766-0.989, p=<.05). The 6-minute step test showed excellent test-retest reliability (ICC 0.967; 95% CI 0.766-0.989; p<0.05) and correlated with the 6-minute walk test in patients with coronary artery disease.
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