Test-Retest Reliability and Validity of 1-Minute Sit-to-Stand Test in Patients With Chronic Heart Failure.

ABSTRACT

AIM: The psychometric properties of the 1-minute sit-to-stand (1STS) test have not been investigated in patients with chronic heart failure (CHF). The aim of this study was to evaluate test-retest reliability, construct validity, and minimal detectable change of the 1STS test and to investigate the physiological response to the 1STS test in patients with CHF. METHOD: Forty-three (43) patients with CHF were included. Demographic and clinical features were recorded. To investigate test-retest reliability, participants performed two 1STS tests on the same day. The correlations between the 1STS test and the 6-minute walk test (6MWT), functional class, pulmonary function, quadriceps muscle strength, and physical activity were investigated for validity. The physiological responses and symptom perception were assessed before and after both the 1STS test and 6MWT. RESULTS: Excellent test-retest reliability was found for the 1STS test, with an intraclass correlation of 0.932 (95% confidence interval 0.874-0.963). The minimal detectable change of the 1STST test was 3.7 repetitions. The 1STS test was correlated with 6MWT distance, age, functional class, pulmonary function, quadriceps muscle strength, and physical activity (p<0.05). The 1STS test showed similar changes to the 6MWT in physiological responses and symptom perception (p>0.05), except for leg fatigue (p=0.02). CONCLUSIONS: The 1STS test is reliable and valid in evaluating functional exercise capacity in patients with CHF. The 1STS test reveals similar cardiac demand to the 6MWT. The 1STS test may be considered an option when traditional tests are impractical in terms of space and time.