👤 Luís Eduardo Argenta Malheiros

Interventions have focused on evaluating effective strategies for increasing physical activity (PA) and reducing sedentary behavior (SB) in children and adolescents, which is still a challenge mainly in low- and middle-income countries. Thus, this study aimed to assess the effect of the Movimente Study on device-measured PA and SB in two-time segments of the school day amongst Brazilian adolescents. Six elementary schools were randomized into the intervention (IG) or control group (CG). Participants were in 7th -9th grades. A school year (2017) multicomponent intervention was delivered consisting of three components: (1) teacher training, (2) education curriculum, and (3) school environment. PA and SB were assessed using GT3x + ActiGraph hip-worn accelerometers. The trial's primary outcome was overall device-measured PA and SB. Exploratory secondary analyses examined PA and SB within in-School (08:00-11:59) and out-of-school (12:00-22:00) time segments. A two-level linear mixed model assessed the effect of the intervention on light-intensity PA (LPA), moderate- to vigorous-intensity PA (MVPA), SB, and MVPA/SB ratio within and between groups. There was a significant effect on the IG compared to the CG for MVPA (Coefficient [Coef.] = 16.2; 95% Confidence Interval [95%CI] = 6.9;25.5; p-value = 0.001), SB (Coef. = -22.7; 95%CI = -44.7;-0.7; p-value = 0.043), and MVPA/SB ratio (Coef. = 3.2; 95%CI = 1.2;5.3; p-value = 0.002) performed in the out-of-school segment, but not in the In-school segment. However, there were no significant differences within- nor between-group differences in LPA in both day segments. The Movimente Study was associated with greater increases in MVPA, improvements in the MVPA/SB ratio, and reductions in SB during the out-of-school period compared with control peers. Clinical Trials - NCT02944318. Registration Date: 10/24/2016. Show less