Background It is presumed that physical activity (PA) level declines during the lifespan,
particularly in adolescence. However, currently, there is no study that quantifies these …

Context Being physically active during the early years (age 0–6 years) is vital for healthy
development. Identifying correlates and determinants of physical activity (PA) is crucial to …

Background Longitudinal studies demonstrate an average decline in physical activity (PA)
from adolescence to young adulthood. However, while some subgroups of adolescents …

PURPOSE:: The purpose of this prospective population-based study was to analyze
predictors of changes in physical activity (PA) levels from early to late adolescence …

Background: In spite of all accumulated scientific knowledge on the benefits of physical
activity (PA) for health, high rates of sedentary lifestyle are still observed worldwide. The aim …

Background Adolescent physical activity (PA) levels track into adulthood. However it is not
known if type of PA participated in during adolescence is associated with PA levels later in …

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 …

Background: Alarming secular declines in physical activity (PA) have been observed among
youth over the last decade. A better understanding of the predictors of these declines is …

Background An optimal level of physical activity (PA) in adolescence influences the level of
PA in adulthood. Although PA declines with age have been demonstrated repeatedly, few …

Objective To systematically review and meta-analyse how physical activity (PA) changes
from adolescence to early adulthood (13–30 years). Data sources Seven electronic …