PT  - JOURNAL ARTICLE
AU  - Jessyca P R Selman
AU  - Anderson A de Camargo
AU  - Jenifer Santos
AU  - Fernanda C Lanza
AU  - Simone Dal Corso
TI  - REFERENCE EQUATION FOR THE TWO-MINUTE WALK TEST IN ADULTS AND THE ELDERLY
AID  - 10.4187/respcare.02649
DP  - 2013 Aug 06
TA  - Respiratory Care
PG  - respcare.02649
4099  - http://rc.rcjournal.com/content/early/2013/08/06/respcare.02649.short
4100  - http://rc.rcjournal.com/content/early/2013/08/06/respcare.02649.full
AB  - Background: The two-minute walk test (2MWT) has been used in several health conditions, but the interpretation of its results is limited due to lack of reference values. Objective: The aim of this study was to establish a reference equation to predict the distance walked (DW) in the 2MWT for healthy adults and the elderly, and to test its reproducibility. Methods: We evaluated 390 healthy subjects (195 male), aged 18—89 years, with normal spirometry and no history of previous chronic diseases. Two 2MWTs were performed on the same day, 30 minutes apart. To test the reliability of the prediction equation, 70 subjects (35 male) were prospectively included in the study. Results: Males walked farther than females (221 [202—240] m vs. 199 [164—222] m, respectively; p <0.0001). Significant correlations were observed between DW and age (r = -0.50), weight (r = 0.23), height (r = 0.40), and gender (r = 0.35) (p <0.001 for all). Age and gender persisted in the model to predict DW (R2: 0.51). There was no difference between the DW by the subjects (197 [182 —216]) and that estimated by the prediction equation (197 [179—222]) (p = 0.68). Conclusion: We established a prediction equation that may be used as a reference to interpret performance on the 2MWT performed by adults and the elderly with different health conditions.