Reliability and Validity of a 2-Minute Walk Test in Coronary Artery Bypass Graft Patients
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Abstract
Background: The 2-minute walk test (2MWT) has been studied to demonstrate its relationship and sensitivity to physical functions in coronary artery bypass graft (CABG) patients, however, the data on its reliability and validity in this group of patients compared to a 6-minute walk test (6MWT) are limited. Objective: This study aimed to determine the reliability and validity of the 2MWT compared with the 6MWT in CABG patients. Methods: This analytical study was conducted in 15 CABG patients at the outpatient cardiac rehabilitation clinic, Phramongkutklao Hospital. The patients were divided into two groups to participate in both the 2MWT and the 6MWT trials. The first group started with a trial of 2 times of 2MWT, then 1 time of 6MWT. The second group began with a trial of 1 time of 6MWT, then 2 times of 2MWT. The measurement of walking distance and maximum heart rate was recorded. Results: The reliability of two trials of 2MWT was 149.43 ± 30.96 meters and 148.12 ± 28.55 meters, respectively, with the intraclass correlation coefficient equal to 0.985 (p <0.001). Whereas, the validity of the first and second trials plus an average of 2MWT in both trials had a significant correlation with the 6MWT (r = 0.957, 0.931, and 0.951, respectively; p <0.001). The exercise intensity of 2MWT and 6MWT was 32.37 and 39.41 percent, respectively. Conclusion: The 2-minute walk test yields a high reliability and validity among CABG patients in outpatient cardiac rehabilitation clinic.
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