Results will be described as mean±SD or median [IQR], according to the normality in data distribution, analyzed by the Shapiro-Wilk test. In the WP1, depending on data distribution, comparisons among Actigraph GT3x and DirectLife (all the three positions) will be performed using one-way ANOVA or its correspondent Kruskal-Wallis test, with Dunn`s post hoc test. To analyze DirectLife validity, correlations between PAL in both devices (week average of measured outputs in both devices) will be tested either by Pearson or Spearman correlation coefficient, depending on data distribution. To assess DirectLife`s agreement with the criterion method, we will perform a Bland-Altman plot and calculate the intra-class correlation coefficient (ICC) for the energy expenditure and the time spent actively. The level of significance for all comparisons will be set at p<0.05. Data will be analyzed using the statistical package SAS version 9.3 (SAS Institute Inc, Cary, NC, USA).