University Lille, University Artois, University Littoral Côte d'Opale, ULR 7369 - URePSSS - Unité de Recherche Pluridisciplinaire Sport Santé Société, F-59000, Lille, France.
Sport et Sciences Sociales, E3S, UR1342, University of Strasbourg, Strasbourg, France.
BMC Public Health. 2022 Jul 12;22(1):1332. doi: 10.1186/s12889-022-13746-0.
Following an ecological framework, the aim of this study was to highlight the way adolescents invested their time in opportunities to engage in moderate to vigorous physical activity (MVPA) according to whether they were profiled as more or less active. This study's innovation lies in the analysis of MVPA according to social occasions which are understood as opportunities to be active throughout the day (e.g. home, school, transport).
PA data measured by accelerometry (ActiGraph GT3X) for seven consecutive days were compiled, with adolescents' social occasions during the week recorded in a daily digital diary (n = 135). The opportunity ratio of MVPA at each social time is the ratio between time spent in MVPA and the duration of a corresponding social occasion. Following the literature, participants were categorised into three profiles according to their reported amount of MVPA: HEPA active, minimally active and inactive. Non-parametric Wilcoxon signed rank and Kruskal Wallis tests were performed to determine the relative intensity of PA performed at different social occasions, and to investigate whether intensities differed between adolescents with various activity profiles.
Results showed that engagement in MVPA at different social occasions differed according to participant profiles. Mismatch was noticed between the opportunity ratio and the duration of the most and least favorable social occasions for MVPA. For all three profiles, the social occasion "physical education lesson" revealed an opportunity ratio of MVPA (23.6% vs 17.0% vs 13.8%) significantly higher than the overall opportunity ratio of the week (6.9% vs 2.9% vs 1.2%), but of lower duration. Conversely, "home" (5.3% vs 0.0% vs 0.0%) and "school" (outside of PE time) (2.4% vs 0.0% vs 0.0%) represented the two least opportune social occasions for PA in an adolescent's week.
Rethinking engagement with MVPA in the context of temporal opportunities would allow potential ways to intervene within an educational supervised setting to help young people adopt a physically active lifestyle at the end of the key period of adolescence. These results reinforced the importance of context in interventions for PA promotion, opening for "time education" in people.
本研究遵循生态框架，旨在根据青少年的活跃程度，突出他们在参与中等到剧烈身体活动（MVPA）方面如何分配时间。本研究的创新之处在于根据社会场合分析 MVPA，这些社会场合被理解为一整天中进行身体活动的机会（例如，家庭、学校、交通）。
通过加速度计（ActiGraph GT3X）连续七天测量 PA 数据，并在每日数字日记中记录一周内青少年的社会场合（n=135）。每个社会时间的 MVPA 机会比是 MVPA 时间与相应社会场合持续时间的比值。根据文献，参与者根据报告的 MVPA 量分为三种体型：HEPA 活跃型、低度活跃型和不活跃型。采用非参数 Wilcoxon 符号秩和 Kruskal Wallis 检验，以确定在不同社会场合进行 PA 的相对强度，并研究不同活动体型的青少年之间的强度是否存在差异。
结果表明，不同社会场合的 MVPA 参与情况因参与者体型而异。在最有利于和最不利于 MVPA 的社会场合的机会比和持续时间之间发现了不匹配。对于所有三种体型，“体育课”这一社会场合的 MVPA 机会比（23.6% 比 17.0% 比 13.8%）明显高于一周的总体机会比（6.9% 比 2.9% 比 1.2%），但持续时间较短。相反，“家庭”（5.3% 比 0.0% 比 0.0%）和“学校”（体育课以外时间）（2.4% 比 0.0% 比 0.0%）代表一周内青少年最不利于 PA 的两个社会场合。
重新思考在时间机会背景下参与 MVPA 的方式，将有助于在教育监督环境中采取潜在的干预措施，帮助年轻人在青春期关键时期养成积极的生活方式。这些结果强化了在促进 PA 干预措施中考虑背景的重要性，为“时间教育”开辟了道路。
