Purpose: The aim of this study was to compare common reduction algorithms for ActiGraph accelerometer data using three software packages in order to identify their impact on the number of subjects with valid data. Methods: 200 adolescents from the UP&DOWN Study wore the GT1M and GT3X ActiGraph ...
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 ...
Purpose: Limitations in monitoring of physical activity (PA) call for the application of triangulation approaches. The goal of the study is to present a verified triangulation approach to monitor daily PA in adolescents on an example of selected characteristics of PA and to suggest how to interpret the data more ...
Purpose: To quantify the proportion (%) of time spent in different body positions within incremental bands of accelerometer determined cadence (steps/min). Methods: This was a secondary analysis of SenseCam camera images and ActiGraph GT3X+ accelerometer data concurrently worn during waking hours by 40 adults (70% male; 36±12 years-old; BMI=23±3 kg/m2) for 3...
Purpose: To investigate whether time spent outdoors measured objectively by a person wearing a camera is positively related to objectively measured physical activity (PA) time and intensity in adults. Methods: Adults (N=62, 21-82 years old) wore an ActiGraph accelerometer and Sensecam for 1 to 8 days. Sensecam images were annotated for indoor ...
Purpose: To examine (1) associations between objectively measured physical activity (PA) and Subjective Wellbeing (SWB), (2) associations between objectively measured Sedentary Behavior (SB) and SWB; and (3) whether the relationship of PA and SB with SWB varies by PA or SB measurement method (objective vs. self-report). Methods: 146 adult Latinas recruited to a PA ...
Purpose: Habit formation offers an innovative technique for promoting long-term behavior change and consistency in the timing of a target behavior is thought to be important to initiating and learning a new habit. The aim of this analysis was to assess whether consistency of exercise timing was associated with overall ...
Purpose: Explore environment-related patterns of GPS signal-loss, levels of objectively measured physical activity (PA) during periods of GPS signal loss, and the effect of missing GPS data on relationships between environmental variables, PA and sedentary behavior. Methods: Eight free-living studies using GPS and accelerometer devices were pooled, representing a range ...
Purpose: The objective of this study was to compare accelerometer data taken with an onboard accelerometer in a smartphone (Droid A855) with accelerations recorded by a stand-alone accelerometer (ActiGraph GT3x+). Methods: A smartphone application was developed to record the time varying acceleration from the Droid’s onboard three dimensional ...
Purpose: Being outdoors is as a correlate for enhanced physical activity (PA), but the association has seldom been investigated using objective measures. This paper investigates the association between week day outdoor time and context-specific moderate to vigorous PA (MVPA) by gender. Methods: Children (n=170, 11-16 years old) from the When ...