Development of an evidence-based intervention improving body composition and autonomous exercise motivation in youngsters

Abstract

Background: We aim to combat obesity in youngsters (11-13y), combining biological and psychological insights. Concerning body composition, overweight youngsters have a higher muscle mass compared with normal-weight youngsters. They are stronger and better in exercises wherein the focus is on absolute strength, making them more motivated to engage in strength exercise and ultimately maintain a physically active lifestyle (DOI:10.1097/MCO.0000000000000099). Methods: Applying a theory- and evidence-based approach, we developed an intervention improving body composition and autonomous exercise motivation. Findings: The school-based intervention consists of: 1. A guideline for Physical Education teachers to safely integrate strength exercises in PE-classes, based on current insights of strength exercises in youth. 2. A motivational intervention guideline for teachers to increase the autonomous motivation to exercise, with online and face-to-face lessons. 3. An online environment for youngsters to monitor their own progress (physically and motivationally). We will show materials and movies about the program. Discussion: This multidisciplinary approach aims to make youngsters more motivated to be physically active, resulting in a healthier body composition. This will be evaluated in an RCT.