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2018 | 10 | 1 |
Tytuł artykułu

Validation of accelerometer for measuring physical activity in free-living individuals

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Języki publikacji
EN
Abstrakty
EN
Background: The aim of this research was to validate a triaxial GT3X accelerometer against doubly labelled water for measuring total energy expenditure (TEE) in a study of free-living Dutch adults and to compare the two prediction equations used to calculate accelerometerderived activity related energy expenditure. Material/Methods: We used a measurement error model to estimate bias in the mean TEE, a correlation coefficient between measured and true TEE (a validity coefficient, which quantifies loss of statistical power to detect association) and the attenuation factor (which quantifies bias in the association), with and without conditioning on age, sex and BMI. We proposed a calibration method for the accelerometer-based TEE. Results: The accelerometer underestimated TEE by about 500kcal/day. The validity coefficient estimate conditional on age, sex and BMI was 0.8; the same value was observed for the attenuation factor estimate. With the devised calibration method, the bias in accelerometerderived mean TEE reduced to 6 kcal/day, validity coefficient estimate increased to 0.95 and attenuation factor to 0.94. Conclusions: The GT3X accelerometer would underestimate mean TEE, lead to minimal loss in statistical power to detect significant association, and would result in biased estimate of the association between TEE and a health outcome.
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Twórcy
autor
  • Department of Biometrics, Wageningen University and Research, Wageningen, The Netherlands
  • Department of Internal Medicine, Yale University, New Haven, USA
  • Department of Biometrics, Wageningen University and Research, Wageningen, The Netherlands
  • Division of Human Nutrition, Wageningen University and Research, Wageningen, The Netherlands
  • Dision of Human Nutrition, Wageningen University and Research, Wageningen, The Netherlands
autor
  • Division of Human Nutrition, Wageningen University and Research, Wageningen, The Netherlands
  • Nutritional Methodology and Biostatistics Group, International Agency for Research on Cancer, Lyon, France
  • Department of Biometrics, Wageningen University and Research, Wageningen, The Netherlands
  • Department of Biometrics, Wageningen University and Research, Wageningen, The Netherlands
  • Division of Human Nutrition, Wageningen University and Research, Wageningen, The Netherlands
  • Department of Statistics, Mathematical Modelling and Data Logistics, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
Bibliografia
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Typ dokumentu
Bibliografia
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