Research Database

500 results for "Children"


Physical activity and sedentary behavior across three time-points and associations with social skills in early childhood

  • Published on Jan 7, 2019

Background: The growth and development that occurs in early childhood has long-term implications, therefore understanding the relevant determinants is needed to inform early prevention and intervention. The objectives of the study were to examine: 1) the longitudinal associations of physical activity and sedentary behavior with social skills and 2) how physical activity ...



Comparison of Polar Active Watch and Waist- and Wrist-Worn ActiGraph Accelerometers for Measuring Children’s Physical Activity Levels during Unstructured Afterschool Programs

  • Published on Sep 4, 2018

Background: The purpose of this study was to examine the convergent validity of the Polar Active Watch (PAW), a consumer-grade wrist-worn activity monitor, against waist- and wrist-worn research-grade monitors, the ActiGraph GT3X+/GT9X accelerometers, in children. Methods: Fifty-one children (18 boys; mean age = 10.30 ± 0.91 years) wore the three monitors (PAW, ...


Correlates of intensity-specific physical activity in children aged 9-11 years: a multilevel analysis of UK data from the International Study of Childhood Obesity, Lifestyle and the Environment

  • Published on Feb 2018

Objectives: Physical activity (PA) can provide numerous physical and psychological health gains, yet a low proportion of children in England are sufficiently active to accrue benefit. Analyzing the correlates of PA from a socioecological perspective may help to identify factors that promote versus discourage PA. The purpose of the present ...


Impact of a classroom standing desk intervention on daily objectively measured sedentary behavior and physical activity in youth

  • Published on Mar 2, 2018

Objectives: We investigated the impact of a standing desk intervention on daily objectively monitored sedentary behavior and physical activity in 6th grade school students. Design: Cluster non-randomised controlled trial. Method: Two classes (intervention students: n=22 [aged 11.8±0.4years]; control students: n=27 [11.6±0.5years]) from a public school in Lisbon were selected. The ...


Actigraphy-based sleep estimation in adolescents and adults: a comparison with polysomnography using two scoring algorithms

  • Published on Jan 18, 2018

Objectives: Actigraphy is widely used to estimate sleep-wake time, despite limited information regarding the comparability of different devices and algorithms. We compared estimates of sleep-wake times determined by two wrist actigraphs (GT3X+ versus Actiwatch Spectrum [AWS]) to in-home polysomnography (PSG), using two algorithms (Sadeh and Cole-Kripke) for the GT3...


Sleep patterns in children differ by ethnicity: cross-sectional and longitudinal analyses using actigraphy

  • Published on Feb 2018

Objectives: To determine whether sleep patterns (duration, timing, efficiency) differ by ethnicity. Design: Longitudinal study. Setting: Dunedin, New Zealand. Participants: A total of 939 children (48% male) aged 4-12 years (572 European, 181 Māori, 111 Pacific, 75 Asian). Measurements: All measurements were obtained at months 0, 12, and 24. Anthropometry was obtained using standard techniques, and parents completed ...


Defining Accelerometer Nonwear Time to Maximize Detection of Sedentary Time in Youth

  • Published on Dec 23, 2017

Purpose: The present study examined various accelerometer nonwear definitions and their impact on detection of sedentary time using different ActiGraph models, filters, and axes. Methods: In total, 61 youth (34 children and 27 adolescents; aged 5-17 y) wore a 7164 and GT3X+ ActiGraph on a hip-worn belt during a 90-minute structured sedentary activity. ...


Exploring Accelerometer Versus Self-Report Sleep Assessment in Youth With Concussion

  • Published on Dec 7, 2017

Abstract: This study examines accelerometer-based and self-report assessment of sleep disturbance from a larger prospective cohort of youth 5 to 18 years of age with postconcussive injury. Twenty-one participants with self-reported sleep disturbance were evaluated using accelerometers. Participants completed the Pittsburgh Sleep Quality Index (PSQI) every 48 hours and also measured sleep via ...