Research Database

1186 results for "Research Database"


MVPA and Sedentary Behavior In Community Dwelling Older Men Measured By Accelerometer

  • Presented on June 17, 2013

Purpose The 2010 physical activity (PA) guidelines for older adults in the UK include a target of 150 minutes of moderate or vigorous PA (MVPA)/week and recommend minimizing time spent being sedentary in extended periods. There are few large studies of objectively measured PA in the elderly which can estimate the ...


A Method to Estimate Free-Living Active and Sedentary Behavior from an Accelerometer

  • Published on July 15, 2013

Purpose: The purpose of this study was to develop and validate two novel machine-learning methods (soj-1x and soj-3x) in a free-living setting. Methods: Participants were directly observed in their natural environment for ten consecutive hours on three separate occasions. PA and SB estimated from soj-1x, soj-3x ...


Contemporaneous Assessment Of Physical Activity, Sedentary Behavior And Sleep Using An Actigraph GT3X+ Accelerometer

  • Presented on June 18, 2013

Introduction Physical activity (PA), sedentary behavior (SB) and sleep form the behavioral tripartite of energy expenditure and appear inter- and independently related to cardiometabolic disease and cancer. The ability to collect valid data on all three behaviors contemporaneously using one type of accelerometer is important because it may improve our ...


Congruency of Motion Sensors to Detect Change following a Sedentary Behavior Intervention

  • Presented on June 17, 2013

Introduction Time spent in sedentary behavior (SB) has deleterious effects on health. As a result, there is a strong scientific need to evaluate methods to assess SB. Purpose To determine responsiveness of two motion sensors to detect change in free-living, occupational SB during an intervention to decrease sitting activity. Methods ...



Normalization And Extraction Of Interpretable Metrics From Raw Accelerometry Data

  • Presented on June 17, 2013

Introduction Accelerometers provide objective measurements of human activity and have been used extensively in health studies. In many of these studies, analysis was done not based on the raw data, but on summarized metrics like “activity counts”, which are the result of proprietary pre-processing software. Such metrics do not have ...


Inferred Time In Bed Independently Predicts Levels Of Daytime Activity And Sedentary Behavior

  • Presented on June 17, 2013

Purpose Increased all-cause mortality has been consistently associated with longer (8-10 hours+) self-reported sleep duration. The possibility that longer sleep may impact survival through inactive lifestyles was proposed by Morgan (2007), and subsequently tested by Hartescu et al (2012) who concluded that, independent of health status, longer sleep duration, and the inevitably ...


Predicting Activity Type from Accelerometer Data in Older Adults

  • Presented on June 17, 2013

Introduction Assessing time spent in different activity types may be important for early detection of mobility limitations in older adults. To date, accelerometer-based activity type prediction using machine learning algorithms have not been validated for this segment of the population. Therefore, the aim of this study was to use Random ...


Calibration And Cross-validation Of Wrist Worn Actigraph GT3X+ In Young Preschoolers

  • Presented on June 17. 2013

Introduction In order to obtain accurate estimates of sedentary time and physical activity in young children objective methods are needed. Wrist worn accelerometers have shown good feasibility among participants in previous studies. The acceleration signal collected by many commercially available activity monitors is usually summarized in an arbitrary unit (counts). ...