Contemporaneous trajectories of physical activity and screen time in adolescents

Abstract

Adolescents often report low moderate-to-vigorous physical activity (MVPA) and high screen time. We modeled sex-specific MVPA and screen time trajectories during adolescence and identified contemporaneous patterns of evolution. Data were drawn from two longitudinal investigations. NDIT included 1294 adolescents recruited at age 12-13 who completed questionnaires every 3 months for 5 years. MATCH included 937 participants recruited at age 9-12 who completed questionnaires every 4 months for 7 years. MVPA was measured as the number of days per week being active for at least 5 minutes (NDIT) or 60 minutes (MATCH). In both studies, screen time was measured as the number of hours spent weekly in screen activities. In each study, sex-specific group-based trajectories were modeled separately for MVPA and screen time from grade 7 to 11. Contemporaneous patterns of evolution were examined in mosaic plots. In both studies, five MVPA trajectories were identified in both sexes, and four and five screen time trajectories were identified in boys and girls, respectively. All combinations of MVPA and screen time trajectories were observed. However the contemporaneous patterns of evolution were favorable in 14-31% of participants (i.e., they were members of the stable high MVPA and the lower screen time trajectories). 
 
 Novelty bullets:
 • MVPA and screen time trajectories during adolescence and their combinations showed wide variability in two Canadian studies.
 • Up to 31% of participants showed favorable contemporaneous patterns of evolution in MVPA and screen time.
 • Using uniform methods for trajectory modeling may increase the potential for replication across studies.
 
 
 

Corrélats du succès perçu des interventions de promotion de la santé dans les écoles primaires

“…Diffuser cet article sur Twitter https://doi.org/10.24095/hpcdp.42.9.03f diminue généralement de l'enfance à l'ado lescence et au début de l'âge adulte 3,4 ), une alimentation saine (comme l'atteinte de niveaux adéquats de consom mation de légumes, de fruits et de céréales complètes), les comportements de con sommation de substances (en particulier la consommation d'alcool, de tabac et de cannabis, qui peut commencer tôt et s'intensifier à l'adolescence) 5 et la sensi bilisation aux comportements agressifs (en particulier l'intimidation verbale, phy sique et cybernétique). Les IPS en milieu scolaire constituent un volet important de stratégies en santé publique plus générales qui visent à encourager les comporte ments favorables à la santé chez les enfants dès leur plus jeune âge 6 .…”

Physical activity and psychopathology: are long-term developmental trajectories of physical activity in children and adolescents associated with trajectories of general mental health problems and of attention-deficit hyperactivity (ADHD) symptoms?

“…Concerning PA, several studies have reported also different developmental trajectories for PA [43][44][45][46][47][48][49][50]. According to a recent systematic review of distinct trajectories of PA, three or four different trajectory classes were most frequently found among the reviewed studies, and several of the trajectories described a decline in PA during later childhood and adolescence [51].…”