Validity and Reliability of the 6-Minute Step Test in Healthy Individuals: A Cross-sectional Study
Validity and Reliability of the 6-Minute Step Test in Healthy Individuals: A Cross-sectional Study
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DOI：
10.1097/jsm.0000000000000190
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发表时间：
2016-01-01
影响因子：
2.7
通讯作者：
Pires Di Lorenzo, Valeria A.
中科院分区：
文献类型：
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作者：
Arcuri, Juliano F.;Borghi-Silva, Audrey;Pires Di Lorenzo, Valeria A.
目的：为了确定6分钟台阶试验（6 MST）的可靠性和有效性，并建立此test.Design的参考性能值：前瞻性观察横断面研究。设置：肺活量测定和呼吸物理治疗实验室，联邦大学圣卡洛斯（机构）。参与者：91个人[42名男性和49名女性，平均年龄= 39岁（SD，17岁）]没有任何诊断疾病和正常的运动能力[6分钟步行试验（6 MWT）>75%的预测正常]。独立变量：参与者进行了两个6 MST的1天和两个6 MWT的另一天随机顺序。此外，年龄，性别，身高，体重，下肢长度，腹围，体脂百分比，和脂肪的质量获得。主要结果measurements：重测信度进行了评估，通过比较的结果，两个6 MST使用组内相关系数（ICC）和Bland-Altman图。有效性进行了评估，通过比较6 MST的结果，6 MWT使用皮尔逊相关系数的结果。结果：第一次和第二次测试的成绩（平均步数SD）分别为149 ± 34和149 ± 36步，与6 MWT的距离（m）相关（r = 0.72; P < 0.05）。6分钟步进试验性能可靠（ICC = 0.9; 95%置信区间：0.85-0.93）。预测前6 MST参考值的方程具有显著性（P < 0.001和R-2 = 0.48）：女性的表现（步数）= 174至1.05 x年龄（岁），男性的表现（步数）= 209至1.05 x年龄（岁）。此外，步数可以通过具有中等预测强度的人口统计学和人体测量学变量来预测。
Objective:To determine the 6-minute step test's (6MST) reliability and validity and to establish reference performance values of this test.Design:Prospective observational cross-sectional study.Setting:Spirometry and Respiratory Physiotherapy Laboratory, Federal University of SAo Carlos (institutional).Participants:Ninety-one individuals [42 men and 49 women, mean age = 39 years (SD, 17 years)] without any diagnosed diseases and with normal exercise capacity [6-minute walk test (6MWT) >75% of the predicted normal].Independent Variables:Participants underwent two 6MST on 1 day and two 6MWT on another day in randomized order. Furthermore, age, gender, height, weight, lower limbs length, abdominal circumference, percentage of body fat, and fat-free mass were obtained.Main Outcome Measures:Test-retest reliability was assessed by comparing the findings of the two 6MST using the intraclass correlation coefficient (ICC) and Bland-Altman plot. Validity was assessed by comparing outcomes of the 6MST to outcomes of 6MWT using the Pearson correlation coefficient. A multiple regression analysis was conducted using the stepwise method to develop an equation to predict reference values.Results:The performance (mean steps SD) in the first and second test was 149 34 and 149 +/- 36 steps, respectively, which was correlated to distance (in meters) in 6MWT (r = 0.72; P < 0.05). Six-minute step test performance was reliable (ICC = 0.9; 95% confidence interval: 0.85-0.93). The equation to predict reference values for the first 6MST was significant (P < 0.001 and R-2 = 0.48): Performance((steps)) = 174 to 1.05 x Age((years)) to women and Performance((steps)) = 209 to 1.05 x Age((years)) to men.Conclusions:Six-minute step test is a reliable and valid test. Moreover, the number of steps may be predicted by demographic and anthropometric variables with moderate strength of prediction.