Improving Early-adolescent Girls' Motor Skill: A Cluster Randomized Controlled Trial.

Background: Physical activity (PA) levels decline substantially during adolescence, and are consistently lower in girls. Competency in a range of fundamental movement skills (FMS) may serve as a protective factor for the decline in PA typically observed in adolescent girls; yet, girls' mastery in FMS is low. Whilst interventions can improve FMS, there is a lack of interventions targeting girls, and very few are conducted in high schools. Additionally, interventions are usually conducted by researchers, not teachers, and thus have little chance of being embedded into curricula. Purpose: To evaluate the effectiveness of a school-based intervention, delivered by teachers, in improving adolescent girls' FMS. Method: Four all-girls Australian secondary schools were recruited and randomised into intervention or control groups. In total, 190 Year 7 girls (103 control/87 intervention, mean age 12.4 +/- 0.3 years) completed baseline and post-test measures at 12 weeks. Six FMS (i.e., catch, throw, kick, jump, leap and dodge) were measured using the Victorian FMS Assessment instrument. Mixed models with post-test skill (i.e., locomotor, object control and total skill) as the outcome, adjusting for baseline skill, intervention and control status, and relevant covariates, as well as accounting for clustering at school and class level, were used to assess the intervention impact. Results: There were significant intervention effects, and large effect sizes (Cohen's d) noted in locomotor (p = 0.04, t = 5.15, d = 1.6), object control (p =

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