Measuring Energy Expenditure After Stroke Validation of a Portable Device

Background and Purpose—Current means of assessing physical activity and energy expenditure have restrictions in stroke, limiting our understanding of its role in therapeutic management. This study validates a portable multisensor array for measuring free-living total energy expenditure compared with a gold standard method (doubly labeled water) in individuals with stroke. Methods—Daily energy expenditure was measured in 9 participants with stroke (738 years) over a 10-day period with 2 techniques: a portable multisensor array and doubly labeled water. Results—Bland-Altman analysis revealed a mean difference of 94 kcal/day (3.8%) in total energy expenditure measures given by the multisensor array in comparison to doubly labeled water with lower and upper limits of agreement of276 to 463.8 kcal/day (2473468 versus 2380551, P0.167). There was strong agreement between the multisensor array and labeled water methods of capturing total daily energy expenditure (r0.850, P0.004). Conclusions—The multisensor array is a portable and accurate method of capturing daily energy expenditure and may assist in understanding how stroke influences free-living energy expenditure and aid in clinical management. (Stroke. 2012;43:00-00.) Key Words: accelerometry doubly labeled water physical activity Stroke is a leading cause of functional impairment.1 Thedirect neurological effects of stroke can lead to dimin