School of Kinesiology and Physical Activity Sciences, Faculty of Medicine, Université de Montréal, Montreal, Québec, Canada.
Centre hospitalier de l'Université de Montréal Research Centre, Québec, Canada.
Scand J Med Sci Sports. 2022 Aug;32(8):1258-1267. doi: 10.1111/sms.14174. Epub 2022 May 13.
Physical activity (PA) motives are associated with both moderate-to-vigorous intensity PA (MVPA) and mental health. Studies examining whether PA motives relate directly to mental health or indirectly through MVPA are lacking. This study examined the direct effect of five PA motives (i.e., enjoyment, competence, fitness, social, appearance) on mental health and their indirect effects through MVPA in adolescents. A total of 424 participants (57.1% females) ages 14-15 years from the longitudinal MATCH study were included. Mediation analyses, based on the counterfactual framework, assessed the natural direct effect of PA motives on mental health, and the natural indirect effects through MVPA. Separate models were conducted for each PA motive. Natural direct effects were observed for enjoyment ( [95%CI] = 2.12 [0.34, 3.90]), competence ( [95%CI] = 1.58[0.28, 2.88]), fitness ( [95%CI] = 1.42[0.04, 2.80]), and social ( [95%CI] = 2.32[1.03, 3.60]) motives. No natural direct effects were observed for appearance motives. A natural indirect effect through MVPA was observed for fitness motives, and no other natural indirect effects were found. Interventions and public health strategies in adolescents need to acknowledge the importance of enjoyment, competence social and fitness motives in PA to promote mental health, and integrate specific recommendations on the importance of the reasons why adolescents participate in PA.
身体活动（PA）动机与中等至剧烈强度 PA（MVPA）和心理健康都有关。目前缺乏研究检验 PA 动机是否直接与心理健康相关，还是通过 MVPA 间接相关。本研究检验了五个 PA 动机（即愉悦、能力、健身、社交和外表）对青少年心理健康的直接影响，以及它们通过 MVPA 的间接影响。共有 424 名参与者（女性占 57.1%）来自纵向 MATCH 研究，年龄在 14-15 岁之间。基于反事实框架的中介分析评估了 PA 动机对心理健康的直接影响，以及通过 MVPA 的间接影响。为每个 PA 动机分别进行了模型分析。在愉悦（ [95%CI] = 2.12 [0.34, 3.90]）、能力（ [95%CI] = 1.58[0.28, 2.88]）、健身（ [95%CI] = 1.42[0.04, 2.80]）和社交（ [95%CI] = 2.32[1.03, 3.60]）动机方面观察到了直接影响，但在外表动机方面没有观察到直接影响。通过 MVPA 的健身动机存在自然间接影响，但没有发现其他自然间接影响。青少年的干预和公共卫生策略需要认识到 PA 中的愉悦、能力、社交和健身动机对心理健康的重要性，并整合关于青少年参与 PA 的原因的具体建议。
