Validation of accelerometer for measuring physical activity in free-living individuals
Journal Title: Baltic Journal of Health and Physical Activity - Year 2018, Vol 10, Issue 1
Abstract
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.
Authors and Affiliations
George O. Agogo, Hilko van der Voet, Paul J. M. Hulshof, Pieter van ’t Veer, Laura Trijsburg, Fred A. van Eeuwijk, Hendriek C. Boshuizen
Keywords
Related Articles
- EP ID EP522934
- DOI 10.29359/BJHPA.10.1.01
- Views 58
- Downloads 0
Training-related modulations of the respiratory hypoxic and hypercapnic response sensitivity in young elite endurance athletes
Background: The present study was performed to clarify of training-related modulations of the cardiopulmonary system (CPS) response sensitivity to a hypoxic and hypercapnia stimulus in young endurance athletes. The pra...
Quality of life, duration of the disease and the level of pain in patients with rheumatoid arthritis
The aim of the present study is to evaluate life quality of people suffering from RA and determine the influence of illness duration and degree of pain intensity on their quality of life. The group of subjects comprised...
Ways of settling a judo fight at consecutive stages of sports competitions
Background: At successive stages of sports competition, judo contestants aim at achieving the best sports result. Each fight can be resolved by an effectively executed attack before the regular time (ippon or double waz...
The influence of dance on selected risk factors of falls in Parkinson’s disease patients – A pilot study
Background: Parkinson’s disease (PD) patients may develop several motion control disorders leading to deterioration in body balance and general mobility, which in turn increases the risk of falls. The aim of this study w...
Sensitivity to pain and strategies of coping with stress in combat athletes
Background: The aim of the study was to assess the perception of pain (threshold and tolerance to pain of the combat athletes in comparison to those not practicing any sport and checking whether there is a correlation b...