Previous studies have demonstrated that pattern recognition approaches to accelerometer data reduction are feasible and moderately accurate in classifying activity type in children. Whether pattern recognition techniques can be used to provide valid estimates of physical activity (PA) energy expenditure in youth remains unexplored in the research literature. Purpose The ...
Purpose It is a commonly held perception that most young children are naturally active and meet physical activity recommendations. However, there is no scientific evidence available on which to confirm or refute such perceptions. The purpose of this study was to describe the physical activity levels and patterns of Australian ...
Abstract Accurate and reliable methods for assessing human physical activity (PA) energy expenditure (PAEE) are informative and essential for understanding individual behaviors and quantifying the effect of PA on disease, for PA surveillance, and for examining determinants of PA in different populations. This article reviews recent advances in the estimation ...
Purpose This study examines what volume of accelerometry data (h·d-1) is required to reliably estimate preschool children's physical activity and whether it is necessary to include weekday and weekend data. Methods Accelerometry data from 493 to 799 (depending on wear time) preschool children from the Melbourne-based Healthy Active Preschool Years study ...
Background We aimed to examine whether time spent on different sedentary behaviours is associated with bone mineral content (BMC) in adolescents, after controlling for relevant confounders such as lean mass and objectively measured physical activity (PA), and if so, whether extra-curricular participation in osteogenic sports could have a role in ...
Adults with intellectual disabilities (ID) have low levels of physical activity and higher than average rates of related chronic health conditions. Understanding correlates of their physical activity participation may improve health promoting interventions. Forty-two adults with ID participated in a physical activity study. Physical activity knowledge and skills, awareness of ...
Abstract Prior to 2008, data collection from Actigraph accelerometers was only possible in the uniaxial mode. In 2009, Actigraph released the GT3X, which allows triaxial data collection. The purpose of this study was to determine if data collected by the GT3X in the uniaxial mode are comparable to its predecessor, ...
We show results on the Avon longitudinal study of parents and children (ALSPAC) using a new approach for modelling the relationship between health outcomes and physical activity assessed by accelerometers. The key feature of the model is that it uses the histogram of physical activity counts as a predictor function, ...
Opportunities for sedentary-behaviour research using device-based measures are proposed, addressing four main topics: first, there is an explanation of how sedentary behaviours can most usefully be understood, emphasizing how they are distinct from lack of moderate-to-vigorous physical activity (the major focus of current national and international public-health guidelines), together with ...
We assessed the ability of the Polar activity recorder (AR) to measure energy expenditure (EE) during military training. Twenty-four voluntary male conscripts participated in the study and wore an AR on the non-dominant wrist 24 h a day for 7 d. The AR analyzed and stored the frequency of hand movements (f_...