Calibration of activity-related energy expenditure in the Hispanic Community Health Study/Study of Latinos (HCHS/SOL) |
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| Authors: | Pamela A Shaw Robert McMurray Nancy Butte Daniela Sotres-Alvarez Hengrui Sun Mark Stoutenberg Kelly R Evenson William W Wong Ashley E Moncrieft Lisa AP Sanchez-Johnsen Mercedes R Carnethon Elva Arredondo Robert C Kaplan Charles E Matthews Yasmin Mossavar-Rahmani |
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| Institution: | 1. Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, USA;2. Department of Exercise and Sports Science, College of Arts and Sciences, University of North Carolina at Chapel Hill, USA;3. USDA/ARS Children''s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, USA;4. Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, USA;5. Department of Public Health Sciences, Miller School of Medicine, University of Miami, USA;6. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, USA;7. Department of Psychology, University of Miami, USA;8. Departments of Psychiatry and Surgery, Biological Sciences Division, University of Illinois at Chicago, USA;9. Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, USA;10. Institute of Behavioral and Community Health, Graduate School of Public Health, San Diego State University, USA;11. Department of Epidemiology & Population Health, Albert Einstein College of Medicine, USA;12. Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, USA;13. Division of Cancer Epidemiology and Genetics, National Cancer Institute, USA |
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| Abstract: | ObjectivesUsual physical activity (PA) is a complex exposure and typical instruments to measure aspects of PA are subject to measurement error, from systematic biases and biological variability. This error can lead to biased estimates of associations between PA and health outcomes. We developed a calibrated physical activity measure that adjusts for measurement error in both self-reported and accelerometry measures of PA in adults from the US Hispanic Community Health Study/Study of Latinos (HCHS/SOL), a community-based cohort study.DesignTotal energy expenditure (TEE) from doubly labeled water and resting energy expenditure (REE) from indirect calorimetry were measured in 445 men and women aged 18–74 years in 2010–2012, as part of the HCHS/SOL Study of Latinos: Nutrition & Physical Activity Assessment Study (SOLNAS). Measurements were repeated in a subset (N = 98) 6 months later.MethodCalibration equations for usual activity-related energy expenditure (AEE = 0.90 × TEE-REE) were developed by regressing this objective biomarker on self-reported PA and sedentary behavior, Actical accelerometer PA, and other subject characteristics.ResultsAge, weight and height explained a significant amount of variation in AEE. Actical PA and wear-time were important predictors of AEE; whereas, self-reported PA was not independently associated with AEE. The final calibration equation explained fifty percent of variation in AEE.ConclusionsThe developed calibration equations can be used to obtain error-corrected associations between PA and health outcomes in HCHS/SOL. Our study represents a unique opportunity to understand the measurement characteristics of PA instruments in an under-studied Hispanic/Latino cohort. |
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| Keywords: | Accelerometry Calibration Doubly labeled water Indirect calorimetry Measurement error Self-assessment |
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