Agreement between physical activity measured by Actical activity monitor and as a component total energy expenditure measured by doubly labeled water

Researchers frequently use accelerometers to measure physical activity energy expenditure (PAEE) in free-living persons. Although accelerometers are promising tools for this purpose, few studies have validated accelerometry against gold standard methods, such as the doubly labeled water (DLW) method. To address this gap in research, this cross-sectional study compared direct measurement of PAEE with the Actical® Activity Monitor to PAEE calculated from the DLW method.