Optimal cut-off score of 2 minutes step test for indicating functional limitation in heart failure patients: A Pilot Study
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Abstract
Background: The 6-Minute Walk Test (6MWT) is often used to assess cardiovascular endurance because of its high reliability and validity. But it has some limitations, so the 2 Minute Step Test (TMST) is another option for testing. However, no study has been found to determine the cut-off score of the TMST in heart failure patients.
Objective: To determine the cut-off score of the TMST as an indicator of functional limitation in heart failure patients.
Methods: Thirty-three heart failure patients were divided into two groups with the 6MWT using a distance of 300 meters, classified the groups with and without functional limitations. Then the TMST was tested. The data was analyzed using the Receiver Operator Characteristic (ROC) Curve to find the cut-off score of the TMST, with a statistical significance level set at p<0.05.
Results: Heart failure patients with functional limitations (n = 12) had an average TMST of 59.92 ± 8.99 times, while those without functional limitations (n = 21) had an average of 82.48 ± 16.24 times, which was statistically significantly different at p < 0.05. The optimal cut-off score of the TMST to indicate functional limitations in heart failure patients was 66, with a sensitivity and specificity of 81% and 75%, respectively.
Conclusion: Heart failure patients with fewer than 66 times are indicated to have decreased cardiovascular endurance, leading to functional limitations.
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