Longitudinal changes in vigorous intensity physical activity from childhood to adolescence: Gateshead Millennium Study.

Objective: The aims of our study were to quantify levels and investigate sex-specific changes and trajectories in VPA longitudinally from age 7 to 15 years.

Design: Longitudinal observational study.

Methods: Participants were part of the Gateshead Millennium Study.

Non-linear longitudinal associations between moderate-to-vigorous physical activity and adiposity across the adiposity distribution during childhood and adolescence: Gateshead Millennium Study.

Objective: Insufficient moderate-to-vigorous intensity physical activity (MVPA) is harmful for youth; however, the evidence for differential effects by weight status is limited. The study aimed to examine associations between MVPA and adiposity by weight status across childhood and adolescence.

Methods: Participants were from the Gateshead Millennium Study.

Timing of the decline in physical activity in childhood and adolescence: Gateshead Millennium Cohort Study.

Background And Aim: There is a widely held and influential view that physical activity begins to decline at adolescence. This study aimed to identify the timing of changes in physical activity during childhood and adolescence.

Methods: Longitudinal cohort study (Gateshead Millennium Study) with 8 years of follow-up, from North-East England.

Can't play, won't play: longitudinal changes in perceived barriers to participation in sports clubs across the child-adolescent transition.

Background: Participation in sports is associated with numerous physical and psychosocial health benefits, however, participation declines with age, and knowledge of perceived barriers to participation in children is lacking. This longitudinal study of children and adolescents aimed to use the ecological model of physical activity to assess changes in barriers to participation in sports clubs to identify age-specific and weight-specific targets for intervention.

Methods: Longitudinal study-Perceived barriers to sports participation were collected from a birth cohort, the Gateshead Millennium Study (n>500) at ages 9 and 12 years.

Risk factors for eating disorder symptoms at 12 years of age: A 6-year longitudinal cohort study.

Eating disorders pose risks to health and wellbeing in young adolescents, but prospective studies of risk factors are scarce and this has impeded prevention efforts. This longitudinal study aimed to examine risk factors for eating disorder symptoms in a population-based birth cohort of young adolescents at 12 years. Participants from the Gateshead Millennium Study birth cohort (n = 516; 262 girls and 254 boys) completed self-report questionnaire measures of eating disorder symptoms and putative risk factors at age 7 years, 9 years and 12 years, including dietary restraint, depressive symptoms and body dissatisfaction.

Development of sedentary behavior across childhood and adolescence: longitudinal analysis of the Gateshead Millennium Study.

Background: In many parts of the world policy and research interventions to modify sedentary behavior of children and adolescents are now being developed. However, the evidence to inform these interventions (e.g.

Influence of adiposity on health-related quality of life in the Gateshead Millennium Study cohort: longitudinal study at 12 years.

Objective: To examine whether adiposity is associated with an impaired quality of life (an individual's perception of their life) in general population samples in early adolescence.

Design And Methods: Relationships between a direct measure of adiposity (fat mass index from bioimpedance) and a proxy measure (waist circumference), and a generic (KIDSCREEN-27) and a weight-specific measure of health-related quality of life (HRQoL, Impact of Weight on Quality of Life-Kids (IWQOL-Kids)) were examined in a longitudinal population-based cohort of young adolescents aged 12 years (n=519). The effects of change in adiposity over time (from 7 years and 9 years) were also examined (n=331-445 in longitudinal analyses).

Objective measurement of sedentary behavior: impact of non-wear time rules on changes in sedentary time.

Background: Accelerometry non-wear time rules might affect sedentary time, and the associations with health outcomes such as adiposity. However, the exact effect of different non-wear time rules on sedentary time and reported changes in sedentary time is unknown. This study evaluated the effect of different accelerometry non-wear time rules on sedentary time and changes in sedentary time from age 9-12 years.

Longitudinal associations between sports participation, body composition and physical activity from childhood to adolescence.

Objectives: Several important research questions have been addressed: (1) What are the cross-sectional associations between sports club participation, objectively measured physical activity, and adiposity? (2) Do measures of physical activity and adiposity predict subsequent sports club participation? (3) Does sports club participation predict subsequent measures of physical activity and adiposity? and (4) Do changes in sports club participation predict changes in objective measures of physical activity and adiposity?

Design: Longitudinal and cross-sectional.

Methods: Data from the Gateshead Millennium Study birth cohort (n=609 at age 7 years) were analysed for associations between adiposity, sports club participation and accelerometer-measured physical activity from ages 7y to 9y to 12y.

Results: Seventy-two per cent of 9 year olds and 63% of 12 year olds took part in a sports club.

Effect of choice of outcome measure on studies of the etiology of obesity in children.

Purpose: Epidemiologic studies of the etiology of childhood obesity often use proxies for adiposity as outcomes. This study aimed to compare the ability of a range of proxy measures to detect associations with sedentary behavior.

Methods: Longitudinal study of children in the Gateshead Millennium Study who were 7 years at baseline and 9 years at follow-up.