Purpose: Accelerometers are commonly used as an objective measure of sedentary behavior, but the method of defining nonwear time directly affects sedentary estimates. The present study examined nonwear definitions and their impact on detection of sedentary time in youth using different ActiGraph models and filters. Methods: 60 youth (34 children and 26 adolescents; ...
Purpose: Seasonal variations in weight gain among children are well documented. Urban minority and overweight youth are at higher risk for weight gain during the summer months, which may result from decreases in physical activity (PA) and sleep. While research has established links between PA, sleep, and BMI, the current ...
Purpose: To analyze the association of the length of sedentary behavior breaks on metabolic risk score (MRS) in Portuguese adolescents (12-18 years). Methods: In 2012 we evaluated 400 adolescents (46% males) in a school-based study. We measured cardiorespiratory fitness (20m_shuttle-run test), blood pressure, height, waist circumference, fasting glucose and insulin, total cholesterol, ...
Purpose: Knowledge of youth physical activity (PA) patterns throughout the week is helpful to plan effective PA interventions. The purpose of this study was to determine time spent in moderate-to-vigorous PA (MVPA) across a typical academic week, with specific attention to activity on weekends, weekdays, outside of school, in school (...
Purpose: The purpose of this study was to explore differences in daily physical activity (PA) patterns between adolescents meeting and not meeting the minimum 60-minute daily moderate to vigorous PA (MVPA) guideline. Methods: 388 adolescents (11 – 13 years) were asked to wear an Actigraph accelerometer for a 9-day period. Data sets were included ...
Purpose: Compared to normal weigh and fit adolescents, overweight and unfit adolescents are more likely to develop cardiovascular disease in adulthood. Despite this, there is insufficient evidence regarding the effectiveness of general schoolbased interventions in these high-risk groups. We assessed if overweight/obese and unfit adolescents responded differently to a ...
Purpose: Ecological models of physical activity (PA) have shown influences on behavior at each level of the model. Ecological models for sedentary time (ST) have not been tested. This study aimed to examine the independent association of personal, social and environmental factors with objectively-measured sedentary time in a large, heterogeneous ...
Purpose: The importance of greenspace for young people’s moderate-vigorous physical activity (MVPA) is still unknown. Few studies exist which combine accelerometry, Global Positioning System (GPS), and Geographic Information Systems (GIS) among youths. This study investigated the relationship between (i) amount of neighbourhood greenspace and MVPA, and (ii) MVPA time ...
Purpose: The FLASHE study is designed to collect data in adolescents and their parents in multiple domains of environment and behavior, with a specific focus on family relationships. The FLASHE study will examine the correlates of obesogenic and cancer preventive behaviors among adolescents and their parents across intra- and interpersonal ...
Purpose: The purpose of this study was to examine the correlation between parent and adolescent levels of physical activity, sedentary behaviors, and sleep among a group of overweight and obese adolescents. Methods: Baseline data of parent-adolescent pairs who enrolled in an E-health lifestyle modification intervention were analyzed for this paper (...