Perceptions of satisfaction with life tend to become less positive during adolescence. Previous research has shown that physical activity may positively explain differences in satisfaction in life between adolescents, however, there is no research examining whether adolescents are more satisfied with their life on days that they are more active than usual. Additionally, little is known about the mechanisms which explain the association between physical activity and satisfaction with life. Therefore, this study aimed to determine the association between daily and average levels of physical activity and satisfaction with life in adolescents, and whether core affect mediated this association. As part of a four-day ecological momentary assessment study, 119 adolescents (mean age = 14.7 years) reported their core affect on multiple occasions each day and their satisfaction with life each evening. Additionally, levels of device-measured physical activity were measured using accelerometers and, self-reported daily levels of leisure-time physical activity, active travel, and household physical activity were assessed. Overall, 69 and 94 participants were included in analyses of the association between device-measured and self-reported physical activity and satisfaction with life respectively. Results from repeated measures correlation analyses showed that adolescents were more satisfied with their life on days when they accumulated more device-measured overall, light, and moderate-intensity physical activity than usual. Additionally, adolescents who reported engaging in more leisure-time physical activity on average than others were more satisfied with their life. Results from mediation analysis showed that energetic arousal might mediate the between-person association between physical activity and satisfaction with life. Therese findings highlight the potential of participation in physical activity to promote wellbeing in adolescents.

在青春期，对生活满意度的看法往往变得不那么积极。先前的研究表明，体育活动可能积极解释青少年之间生活满意度的差异，但是，没有研究调查青少年是否在比平时更活跃的日子对生活更满意。此外，对于解释身体活动与生活满意度之间关联的机制知之甚少。因此，本研究旨在确定青少年每日和平均身体活动水平与生活满意度之间的关联，以及核心情感是否介导了这种关联。作为为期四天的生态瞬时评估研究的一部分，119 名青少年（平均年龄 = 14. 7 岁）每天在多个场合报告他们的核心影响，并在每晚报告他们对生活的满意度。此外，使用加速度计测量设备测量的身体活动水平，并评估自我报告的休闲时间身体活动、积极旅行和家庭身体活动的每日水平。总体而言，分别有 69 名和 94 名参与者参与了设备测量和自我报告的身体活动与生活满意度之间的关联分析。重复测量相关分析的结果表明，青少年在比平时积累更多设备测量的整体、轻度和中等强度身体活动的日子里，对他们的生活更满意。此外，报告平均比其他人从事更多休闲体育活动的青少年对自己的生活更满意。中介分析的结果表明，精力充沛的唤醒可能介导身体活动与生活满意度之间的人际关联。这些研究结果强调了参与体育活动对促进青少年健康的潜力。