Jalili M, et al. - Study authors attempted to develop an equation to predict maximal oxygen uptake (VO2max) based on the 6-minute walk test (6MWT) and body composition in healthy boys. In 349 healthy boys (12.49 ± 2.72 years), direct VO2max, 6-minute walk distance, and anthropometric characteristics were measured. They used multiple regression analysis to generate VO2max prediction equations and Pearson correlation was used to evaluate the relationship between measured and predicted VO2max. In healthy boys, this research provided a relatively accurate and convenient VO2max prediction equation based on the 6MWT and body mass index. Results of this study suggested that this model could be used for evaluation of cardiorespiratory fitness of boys in different settings.