Education Commons^™

Wrist-Based Accelerometer Cut-Points To Identify Sedentary Time In 5-11-Year-Old Children, Jessica Chandler, Michael W. Beets, Pedro Saint-Maurice, Robert Glenn Weaver, Dylan P. Cliff, Clemens Drenowatz, Justin B. Moore, Xuemei Sui, Keith Brazendale

Faculty of Social Sciences - Papers (Archive)

Background: The objective of this paper is to derive a wrist-placed cut-point threshold for distinguishing sedentary behaviors from light-intensity walking using the ActiGraph GT3X+ in children. Methods: This study employed a cross-sectional study design, typically used in measurement-related studies. A sample of 167 children, ages 5-11 years (mean ± SD: 8.0 ± 1.8 years), performed up to eight seated sedentary activities while wearing accelerometers on both wrists. Activities included: reading books, sorting cards, cutting and pasting, playing board games, eating snacks, playing with tablets, watching TV, and writing. Direct observation verified sedentary behavior from light activity. Receiver operator characteristic (ROC) …

Relative Validity Of 3 Accelerometer Models For Estimating Energy Expenditure During Light Activity, Alexander Allan Wetten, Marijka Batterham, Sze Yen Tan, Linda Tapsell

Faculty of Social Sciences - Papers (Archive)

Background: With physical inactivity inextricably linked to the increasing prevalence of obesity, there is a need for validated methods that measure free-living energy expenditure (EE) within sedentary environments. While accelerometers enable these measurements, few studies have compared device accuracy in such settings. The aim of this study was to investigate the relative validity of the Actigraph, RT3 and SenseWear Armband (SWA). Methods: Twenty-three (11 male, 12 female) participants (age: 25.3 ± 6.3 yr; BMI: 22.6 ± 2.7) wore 3 accelerometers at designated sites during a 4-hour stay in the Whole Room Calorimeter (WRC). Participants performed 2 10-minute bouts of light-intensity …

Measuring Adolescent Boys' Physical Activity: Bout Length And The Influence Of Accelerometer Epoch Length, Taren Sanders, Dylan Cliff, Chris Lonsdale

Faculty of Social Sciences - Papers (Archive)

Objectives

Accurate, objective measurement is important for understanding adolescents' physical activity (PA) behaviour. When using accelerometry to objectively measure PA, a decision must be made regarding how frequently data is recorded (i.e., epoch length). The purpose of this study was to examine i) PA bout length, and ii) the effect of variations in accelerometer epoch length on PA estimates during physical education (PE) and leisure time in adolescent boys.

Design

Cross-sectional study.

Methods

Year 9 boys (N=133; mean age ±SD =14.36±0.48 years) wore accelerometers during two PE lessons, and for a period of seven consecutive days. Data were reintegrated from …