Reliability and agreement in the evaluation of gait speed in cardiac surgery
DOI:
https://doi.org/10.11606/issn.2317-0190.v32i3a239825Keywords:
Reproducibility of Results, Walking Speed, Thoracic Surgery, Physical Functional PerformanceAbstract
Objective: To evaluate the reliability and agreement of the test-retest in assessing walking speed in patients undergoing cardiac surgery (CS), as well as to quantify the learning effect between the tests. Method: A prospective longitudinal study that assessed walking speed using the Six-Meter Walking Speed Test (6mWST) in the preoperative period, postoperative period (PO), and after hospital discharge. Data were analyzed using the intraclass correlation coefficient (ICC) and the minimum detectable alteration (MDC95). Results: The sample (n = 82; 62.51 ± 8.88 years) showed excellent test-retest reliability of the 6MWT in the preoperative period (ICC= 0.98; 95% CI: 0.97–0.99) (p< 0.001), in the PO (ICC = 0.97; 95% CI: 0.94–0.99) (p< 0.001), and after hospital discharge (ICC= 0.97; 95% CI: 0.94–0.99) (p< 0.001). There was an increase in walking speed between the test and retest in the PO and after hospital discharge, with a mean learning effect of 0.06 m/s (95% CI: 0.17–0.29 m/s) (p < 0.001). The MDC95 indicates that walking speed in 95% of the sample will vary by less than 0.014 m/s in the preoperative period and less than 0.016 m/s in the PO and after hospital discharge. Conclusion: The test-retest of the 6MWT demonstrated adequate reliability and agreement in patients undergoing CS at the different time points evaluated. A significant learning effect was also observed, indicating that repeating the test is necessary to obtain accurate walking speed measurements.
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