In time 2, however, such positive associations were only found when reallocating time from sedentary or light to MVPA.
Additionally, regarding self-perception, in time 1, isotemporal substitution of sedentary to light PA was the only reallocation associated with increases in perceived MC. Reallocation of 10 min from sedentary to light, or to MVPA, was associated with changes in actual MC, which was consistent from time 1 to time 2. Cross-lagged models exhibited an influence of light and MVPA at time 1 on actual and perceived MC at time 2. When adjusted for sex, age, and body mass index, SEM and the composition consistently predicted actual and perceived MC at time 1 and time 2 (p <. Longitudinal association of movement behaviors with actual and perceived MC, in locomotion, ball skills and overall MC was explored using structural equation models (SEM), compositional analysis, and isotemporal substitution. Children's objectively measured PA and sedentary behaviour, actual and perceived MC were assessed at two time points, one year apart. A longitudinal observational design was used to study 124 typically developed children (45.2% girls), 5-10 years old at baseline. The aim of this study was to analyse the association between physical activity (PA) and motor competence (MC) in primary school children using traditional and compositional data analysis approaches over time (time 1 and time 2).