Travensolo Cristiane de Fátima, Arcuri Juliano Ferreira, Polito Marcos Doederlein
Physical Education Department, Londrina State University, Londrina, Brazil.
Physical Therapy Department, Federal University of São Carlos, São Carlos, Brazil.
Physiother Res Int. 2020 Jan;25(1):e1810. doi: 10.1002/pri.1810. Epub 2019 Oct 10.
To assess the validity and reliability of the 6-min step test (6MST) in individuals with coronary artery disease (CAD).
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.
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.
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.
评估6分钟台阶试验（6MST）在冠状动脉疾病（CAD）患者中的有效性和可靠性。
采用随机交叉设计，35例CAD患者（65.8±9.6岁）由心脏病门诊医生转诊，进行两次6MST和两次6分钟步行试验（6MWT），以评估冠状动脉疾病患者的可靠性。试验执行顺序通过抽签确定。
6MST的重测信度极佳（组内相关系数=0.967；95%CI：0.766，0.989；p<.05）。从第一次到第二次6MST，步数增加了7.9±8.2步，测量技术误差为8.0；p<.001。第一次和第二次试验中，6MWT行走距离与6MST步数之间的相关性分别为0.6和0.7（p<.001）。
6MST是测量CAD患者功能能力的可靠试验。以6MWT作为金标准时，该试验有效。通过6MWT分类在给定三分位数中的受试者，在6MST中处于同一三分位数的概率为88%。
