Accelerometry data from the National Health and Nutrition Examination Study confirms what has been suspected from self-report: after adolescence, people in the United States are very inactive. With age, even this modest activity declines further. Accelerometry data was collected on a subsample of participants from the Health, Aging, and Body Composition study in the final (tenth) year of clinical examination. We are working with this data to study the paterns of true daily activity in older adults. Additionally, we have collected accelerometry and sleep data in a subsample of participants from the Age, Gene/Environment Susceptibility Study in Iceland. Also, as part of this project, we will compare measurements from accelerometers worn at various locations on the body while eldery participants conduct activities of daily living. And, finally, we are testing the use of accelerometers to assess recovery of function after surgery in the elderly.

National Institute of Health (NIH)
National Institute on Aging (NIA)
Investigator-Initiated Intramural Research Projects (ZIA)
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National Institute on Aging
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Arnardottir, Nanna Yr; Koster, Annemarie; Domelen, Dane R Van et al. (2016) Association of change in brain structure to objectively measured physical activity and sedentary behavior in older adults: Age, Gene/Environment Susceptibility-Reykjavik Study. Behav Brain Res 296:118-24
Schrack, Jennifer A; Cooper, Rachel; Koster, Annemarie et al. (2016) Assessing Daily Physical Activity in Older Adults: Unraveling the Complexity of Monitors, Measures, and Methods. J Gerontol A Biol Sci Med Sci 71:1039-48
Brychta, Robert J; Arnardottir, Nanna Yr; Johannsson, Erlingur et al. (2016) Influence of Day Length and Physical Activity on Sleep Patterns in Older Icelandic Men and Women. J Clin Sleep Med 12:203-13
Koster, Annemarie; Shiroma, Eric J; Caserotti, Paolo et al. (2016) Comparison of Sedentary Estimates between activPAL and Hip- and Wrist-Worn ActiGraph. Med Sci Sports Exerc 48:1514-22
Steeves, Jeremy A; Murphy, Rachel A; Zipunnikov, Vadim et al. (2015) Women Workers and Women at Home Are Equally Inactive: NHANES 2003-2006. Med Sci Sports Exerc 47:1635-42
Steeves, Jeremy A; Tudor-Locke, Catrine; Murphy, Rachel A et al. (2015) Classification of occupational activity categories using accelerometry: NHANES 2003-2004. Int J Behav Nutr Phys Act 12:89
Steeves, Jeremy A; Murphy, Rachel A; Crainiceanu, Ciprian M et al. (2015) Daily Patterns of Physical Activity by Type 2 Diabetes Definition: Comparing Diabetes, Prediabetes, and Participants with Normal Glucose Levels in NHANES 2003-2006. Prev Med Rep 2:152-157
Shiroma, Eric J; Kamada, Masamitsu; Smith, Colby et al. (2015) Visual Inspection for Determining Days When Accelerometer Is Worn: Is This Valid? Med Sci Sports Exerc 47:2558-62
Martin, Kathryn R; Koster, Annemarie; Murphy, Rachel A et al. (2014) Changes in daily activity patterns with age in U.S. men and women: National Health and Nutrition Examination Survey 2003-04 and 2005-06. J Am Geriatr Soc 62:1263-71
van der Berg, Julianne D; Bosma, Hans; Caserotti, Paolo et al. (2014) Midlife determinants associated with sedentary behavior in old age. Med Sci Sports Exerc 46:1359-65

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