以最大摄氧量作为金标准的爬楼梯测试的准确性。

Accuracy of the stair climbing test using maximal oxygen uptake as the gold standard.

作者信息

Cataneo Daniele Cristina, Cataneo Antonio José Maria

机构信息

Department of Thoracic Surgery, Júlio de Mesquita Filho Universidade Estadual Paulista-UNESP, Paulista State University at Botucatu School of Medicine, Botucatu, SP, Brazil.

出版信息

J Bras Pneumol. 2007 Mar-Apr;33(2):128-33. doi: 10.1590/s1806-37132007000200005.

DOI:10.1590/s1806-37132007000200005

PMID:17724530

Abstract

OBJECTIVE

To determine the accuracy of the variables related to the fixed-height stair climbing test (SCT) using maximal oxygen uptake (VO2 max) as the gold standard.

METHODS

The SCT was performed on a staircase consisting of 6 flights (72 steps; 12.16 m total height), with verbal encouragement, in 51 patients. Stair-climbing 'time' was measured, and the variables 'work' and 'power' also being calculated. The VO2 max was measured using ergospirometry according to the Balke protocol. We calculated the Pearson linear correlation (r), as well as the values of p, between the SCT variables and VO2 max. To determine accuracy, the VO2 max cut-off point was set at 25 mL/kg/min, and individuals were classified as normal or altered. The cut-off points for the SCT variables were determined using the receiver operating characteristic curve. The Kappa statistic (k) was used in order to assess concordance.

RESULTS

The following values were obtained for the variable 'time': cut-off point = 40 s; x= 41 +/= 15.5 s; r = "0.707; p < 0.005; specificity = 89%; sensibility = 83%; accuracy = 86%; and k = 0.724. For 'power', the values obtained were as follows: cut-off point = 200 w; x= 222.3 +/= 95.2 w; r = 0.515; p < 0.005; specificity = 67%; sensibility = 75%; accuracy = 71%; and k = 0.414. Since the correlation between 'work' and VO2 max was not significant, that variable was discarded.

CONCLUSION

Of the SCT variables tested, using VO2 max as the gold standard, the variable 'time' was the most accurate.

摘要

目的

以最大摄氧量（VO2 max）作为金标准，确定与固定高度爬楼梯试验（SCT）相关变量的准确性。

方法

在由6段楼梯（72级台阶；总高度12.16米）组成的楼梯上，对51例患者进行SCT，并给予言语鼓励。测量爬楼梯“时间”，同时计算“功”和“功率”变量。根据Balke方案，采用运动肺量计测量VO2 max。我们计算了SCT变量与VO2 max之间的Pearson线性相关性（r）以及p值。为确定准确性，将VO2 max的切点设定为25毫升/千克/分钟，并将个体分类为正常或异常。使用受试者工作特征曲线确定SCT变量的切点。使用Kappa统计量（k）评估一致性。

结果

变量“时间”获得以下值：切点 = 40秒；x = 41 ± 15.5秒；r = -0.707；p < 0.005；特异性 = 89%；敏感性 = 83%；准确性 = 86%；k = 0.724。对于“功率”，获得的值如下：切点 = 200瓦；x = 222.3 ± 95.2瓦；r = 0.515；p < 0.005；特异性 = 67%；敏感性 = 75%；准确性 = 71%；k = 0.414。由于“功”与VO2 max之间的相关性不显著，该变量被舍弃。