Reference equations for the six-minute walk distance based on a Brazilian multicenter study

Brazilian Journal of Physical Therapy

Raquel R. Britto¹  Vanessa S. Probst¹  Armele F. Dornelas De Andrade¹  Giane A. R. Samora¹  Nidia A. Hernandes¹  Patricia E. M. Marinho¹  Marlus Karsten¹  Fabio Pitta¹  Veronica F. Parreira¹ 

关键词: walking;    exercise test;    reference values;    regression analysis;    rehabilitation;   

DOI  :  10.1590/S1413-35552012005000122

来源: SciELO

【 摘 要 】

BACKGROUND:It is important to include large sample sizes and different factors that influence the six-minute walking distance (6MWD) in order to propose reference equations for the six-minute walking test (6MWT).OBJECTIVE:To evaluate the influence of anthropometric, demographic, and physiologic variables on the 6MWD of healthy subjects from different regions of Brazil to establish a reference equation for the Brazilian population.METHOD:In a multicenter study, 617 healthy subjects performed two 6MWTs and had their weight, height, and body mass index (BMI) measured, as well as their physiologic responses to the test. Delta heart rate (∆HR), perceived effort, and peripheral oxygen saturation were calculated by the difference between the respective values at the end of the test minus the baseline value.RESULTS:Walking distance averaged 586±106m, 54m greater in male compared to female subjects (p<0.001). No differences were observed among the 6MWD from different regions. The quadratic regression analysis considering only anthropometric and demographic data explained 46% of the variability in the 6MWT (p<0.001) and derived the equation: 6MWDpred=890.46-(6.11×age)+(0.0345×age2)+(48.87×gender)-(4.87×BMI). A second model of stepwise multiple regression including ∆HR explained 62% of the variability (p<0.0001) and derived the equation: 6MWDpred=356.658-(2.303×age)+(36.648×gender)+(1.704×height)+(1.365×∆HR).CONCLUSION:The equations proposed in this study, especially the second one, seem adequate to accurately predict the 6MWD for Brazilians.

【 授权许可】

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