Objective measurement of the evolution of the distribution of physical activity in social times during lockdown against COVID-19: a longitudinal follow-up of French adolescents
Résumé
Introduction
The health crisis and resulting lockdowns are life events which disrupt physical activity (PA) lifestyles for adolescents (Gropper, 2020), a population whose PA levels are already problematic (Allender, 2008). Whilst no other studies have used objective measurements to quantify the loss of PA in youth following lockdowns (Lopez-Valenciano et al., 2021), this study seeks to examine how the lockdown impacted PA according to different social times throughout the day, using accelerometry.
Methods
43 French adolescents (age: 17±1.1 y.o.) participated in a longitudinal study, which took place one week before lockdown (October 2020), and during the second week of lockdown (November 2020) using ActiGraph GT3X accelerometers. Respectively following the algorithms of Troiano (2007) and Freedson (1998), we determined the wearing periods and the PA cut points. At the same time, these adolescents completed a daily digital diary to reconstruct the ten daily social times: transport, home, school, physical education lesson, unsupervised leisure, supervised leisure, household chores, job, meals and rest (Klinker et al., 2014), which were synchronized with the accelerometric data.
Results
Firstly, the overall PA decreases significantly due to the reorganization of social times associated with PA: transport, physical education, supervised leisure. Secondly, we show a significant increase of unsupervised leisure. However, the latter is not able to compensate for the loss of the aforementioned social times. Finally, the loss in PA is correlated with the initial PA profile of the students.
Discussion
We show that lockdown has reorganized the entire distribution of PA across social times, shifting the peak of physical activity from supervised leisure and PE to unsupervised leisure. Based on a temporal division we highlight which population has had its PA the most impacted and, more importantly, which social times are to be targeted in order to reduce this loss of PA.
Domaines
Education
Origine : Fichiers produits par l'(les) auteur(s)