Adolescents are at increased risk for developing mental health problems. The Grow It! app is an mHealth intervention aimed at preventing mental health problems through improving coping by cognitive behavioral therapy (CBT)-inspired challenges as well as self-monitoring of emotions through Experience Sampling Methods (ESM). Yet, little is known about daily changes in well-being and coping during a stressful period, like the COVID-19 pandemic. The current study aimed to elucidate daily changes in positive and negative affect, and adaptive coping, and to better understand the within-person’s mechanisms of the Grow It! app. The sample consisted of 12–25-year old Dutch adolescents in two independent cohorts (cohort 1: N = 476, Mage = 16.24, 76.1% female, 88.7% Dutch; cohort 2: N = 814, Mage = 18.45, 82.8% female, 97.2% Dutch). ESM were used to measure daily positive and negative affect and coping (cohort 1: 42 days, 210 assessments per person; cohort 2: 21 days, 105 assessments). The results showed that, on average, adolescents decreased in daily positive affect and adaptive coping, and increased in their experienced negative affect. A positive relation between adaptive coping and positive affect was found, although independent of the CBT-based challenges. Latent class analysis identified two heterogeneous trajectories for both positive and negative affect, indicating that the majority of participants with low to moderate-risk on developing mental health problems were likely to benefit from the Grow It! app.

青少年出现心理健康问题的风险增加。成长吧！应用程序是一种移动健康干预措施，旨在通过认知行为疗法 (CBT) 启发的挑战以及通过经验采样方法 (ESM) 自我监控情绪来改善应对方式，从而预防心理健康问题。然而，人们对在新冠肺炎 (COVID-19) 大流行等压力时期的健康状况和应对方式的日常变化知之甚少。当前的研究旨在阐明积极和消极情感的日常变化以及适应性应对，并更好地理解“成长”的人体内机制！应用程序。样本由两个独立队列中的 12-25 岁荷兰青少年组成（队列 1：N  = 476，Mage = 16.24，76.1% 女性，88.7% 荷兰人；队列 2：N  = 814，Mage = 18.45，82.8% 女性，97.2% 荷兰人）。ESM 用于测量每日的积极和消极情绪和应对（队列 1：42 天，每人 210 次评估；队列 2：21 天，105 次评估）。结果显示，平均而言，青少年的日常积极情绪和适应性应对减少，而经历的消极情绪增加。研究发现，适应性应对与积极情感之间存在正相关关系，尽管与基于 CBT 的挑战无关。潜在类别分析确定了积极和消极情绪的两种异质轨迹，表明大多数具有低至中等风险的心理健康问题参与者可能会从“成长吧！”中受益。应用程序。