Purpose: The purposes of this study were (1) to add layers and features to a previously published fully automated algorithm designed to identify children's nocturnal sleep and to exclude episodes of nighttime non-wear/wakefulness and potentially misclassified day time sleep episodes, and (2) to validate this refined sleep algorithm (RSA) against sleep ...
Objectives: To validate the GT1M actigraph accelerometer step count function, and the Omron Walking Style Pro pedometer against accelerometer-based activity counts, and to compare pedometer-based and accelerometer-based steps in preschoolers. Design: A sample of 41 preschoolers (21 boys, mean age 5.43 ± 0.63 years) from one preschool in Flanders, Belgium, was included in data ...
Introduction: Assessing the level of physical activity (PA) is highly relevant when talking about health related behavior. Although self-report questionnaires (PAQ) are the most commonly used method for measurement population PA, this type of assessment has limitations. PAQs have to primarily consider the change in PA behavior over lifespan and ...
Purpose: The onboard accelerometers and global positioning system (GPS) receivers on modern smartphones offer considerable promise for the unobtrusive tracking of physical activity (PA) in population research; however, the accuracy of smartphone sensors for assessing PA is uncertain. The purpose of this study was to compare estimates of PA and ...
Purpose: This study compared sitting, standing, and stepping classifications from thigh-worn Actigraph and ActivPAL monitors under laboratory and free-living conditions. Methods: Adults wore both monitors on the right thigh while performing 6 sitting, 2 standing, 8 stepping, and 1 cycling activity under laboratory observation (n=21), and during three days free-living (n=18). Percent of time ...
Background: Physical activity (PA) questionnaires are an affordable and time efficient tool that can be used by physicians to determine if individuals meet PA recommendations (≥150 min/week of moderate to vigorous PA [MVPA] accumulated in bouts ≥10 minutes). The Exercise Vital Signs EVS (Coleman et al. MSSE 2012) questionnaire was recently ...
Background: Objective measures of sedentary behavior (SB) have been validated and used in a number of studies. However, these devices are limited in their ability to provide contextual information regarding the nature of SB. The Sedentary Behavior Record (SBR) is an adaptation of the 3-day Physical Activity Record for quantifying ...
Background: Pregnancy researchers use various physical activity (PA) measurement techniques. However, few studies have evaluated the validity of these techniques in free-living environments, and there is little agreement regarding which may be the best to use. Consensus on this issue would be valuable to future researchers wishing to compare results ...
Background: Accelerometers are increasingly used to objectively estimate free-living energy expenditure (EE) in population-based studies. Published group-level calibration equations are typically used to convert accelerometer count output into applicable EE units. The use of subject-specific calibration equations has been proposed as a way to increase the accuracy of EE ...
Purpose: Objectively measuring physical activity in children is often impractical; thus self-report methods are frequently used but may not be valid for determination of physical activity intensity. This study examined the accuracy and validity of the Block Kids Physical Activity Screener (PAS) for estimating moderate to vigorous physical activity (MVPA) ...