To identify profiles of compositional movement behaviour patterns among children and examine cross-sectional and 12-month associations with adiposity markers and health-related quality of life (HRQoL).

Secondary analysis of data from the TransformUs cluster randomised controlled trial with cross-sectional and 12-month follow-up analyses.

Primary schools in metropolitan and regional areas of Victoria, Australia.

Children aged 7–11 years with valid accelerometer at baseline, regardless of demographic, adiposity and HRQoL data available (n=792), were included in the analytical sample for the latent profile analysis.

Sedentary time, light-intensity physical activity (LPA) and moderate- to vigorous-intensity physical activity (MVPA) along with their respective mean bout lengths were derived from raw acceleration data. Latent profile analysis used these measures (total times, as isometric log ratios and mean bout lengths) as input variables to classify distinct profiles for us as a categorical exposure variable in regression models. Primary outcomes were age- and sex-standardised body mass index, waist circumference and parent-reported HRQoL at baseline. Secondary outcomes were the same measures assessed at 12-month follow-up.

Four distinct profiles were identified. The high MVPA-short sedentary bout profile (n=184) was characterised by the highest levels of MVPA, moderate sedentary time and the shortest mean sedentary bout duration. The low sedentary-high LPA profile (n=54) had the lowest sedentary time, the highest LPA and the longest mean LPA bout duration. Two profiles were characterised by high sedentary time: the high sedentary-long sedentary bout profile (n=149), which had the longest mean sedentary bout durations, and the high sedentary-shorter bouts profile (n=405), which also had high sedentary time but shorter bout durations for all intensities. While the omnibus Wald test for differences across profiles indicated uncertainty in the overall profile effect, the high MVPA-short sedentary bout profile had favourable adiposity levels cross-sectionally compared with the high sedentary-long sedentary bout reference profile in pairwise comparisons. No longitudinal associations were detected.

Four distinct movement profiles were identified. Few pairwise differences between health outcomes were observed. While MVPA remains a key factor for promoting healthy body weight, our findings suggest that a variety of movement patterns - including those characterised by lower sedentary time and higher LPA - may also support health in children.

This study is a secondary analysis of the TransformUs effectiveness-implementation trial, registered with the Australian Clinical Trials Registry (ACTRN12617000204347; 1 April 2017).

TransformUs is a multicomponent school-based programme that offers teachers professional learning and resources aligned with the Australian curriculum to promote physically active teaching and learning, a supportive environment and physical activity opportunities during recess and lunch. The programme was originally developed for students in mainstream primary schools and has been proven efficacious for increasing physical activity and reducing sedentary behaviour in children without disability. The programme has been adapted for delivery with students with disabilities in primary and secondary schools (TransformUs All Abilities). This project aims to determine the implementation at scale and effectiveness of the TransformUs All Abilities programme to increase physical activity among primary and secondary school children and adolescents with disability. This protocol describes the hybrid implementation-effectiveness trial that will be used for this evaluation.

This study employs a hybrid type II implementation-effectiveness trial to evaluate the TransformUs All Abilities programme, targeting all government and independent, primary and secondary schools in Victoria, as well as special and mainstream secondary schools in Queensland and South Australia (n=2173 eligible schools). The effectiveness trial will focus on a subgroup of government/independent special schools for students with mild to moderate intellectual disability in Victoria, involving up to three intervention and three waitlist control schools (n=61 eligible schools). In both trials, outcomes will be guided by the RE-AIM framework focusing on reach, adoption and implementation (implementation trial) and effectiveness (effectiveness trial), with data collected at baseline and 6 months. The effectiveness trial will focus on students’ device-measured physical activity and sedentary behaviour—primary outcomes—and sleep, physical literacy and cognitive functions—secondary outcomes. Teacher feedback on the programme’s adaptation and their experience with programme implementation will also be collected, alongside qualitative feedback from a subsample of students regarding engagement/enjoyment and suggestions for improvements. Implementation data will be analysed descriptively and using linear mixed models to test changes over time. Effectiveness outcomes will be analysed using linear mixed models to compare intervention and waitlist control, accounting for confounding and school/classroom clustering. Interview data will be thematically analysed.

Ethical approval for this trial was obtained from the Deakin University Human Research Ethics Committee (2021-368). Clearance to conduct research in schools was also obtained from the Education Departments of Victoria (2023-004726), Queensland (550/27/2592) and South Australia (2022-0020). Informed consent is required for participation in the study. School staff can enrol in the implementation trial via the TransformUs website, while the effectiveness trial requires organisational, staff, parental/carer consent and student assent. Results will be disseminated through academic publications, scientific conference presentations and summary reports to schools, parents and partner organisations.

ACTRN12622001082796; Universal Trial Number: U1111-1281-1103; ACTRN12622001050741: U1111-1280-8828.