Objective The present nonrandomized controlled trial aimed to evaluate feasibility, acceptability, and preliminary efficacy of a tailored text message intervention for increasing adolescent physical activity, as compared with passive monitoring. Methods Forty adolescents (13–18 years old) received either a tailored text messaging intervention (Network Underwritten Dynamic Goals Engine [NUDGE]; N = 20), or participated in an attention-control condition (N = 20), for 20 days. Physical activity was measured for all participants via continuous accelerometry. Frequency analyses were conducted on program usage and satisfaction ratings to evaluate feasibility and acceptability, and multilevel models were used to evaluate the efficacy hypotheses. Results The vast majority of participants (90%) reported being very or mostly satisfied with the NUDGE program and rated their enjoyment as above average. The intervention group was estimated to spend an average of 20.84 more minutes per day in moderate-to-vigorous physical activity relative to the attention-control group (β = 20.84, SE = 8.19). Exploratory analyses revealed that the intervention group also engaged in 82 fewer minutes of sedentary time per day on average, although this effect was not significant due to the large variability in sedentary time (β = −81.98, SE = 46.86). Conclusions The NUDGE tailored text messaging intervention was feasible, acceptable, and efficacious in increasing physical activity in this sample. Findings warrant additional evaluation of NUDGE as both a standalone physical activity intervention or as part of a multicomponent package.

中文翻译：

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促进青少年体力活动的适应性移动医疗干预

目的 本非随机对照试验旨在评估与被动监测相比，量身定制的短信干预增加青少年身体活动的可行性、可接受性和初步疗效。方法 40 名青少年（13-18 岁）接受量身定制的短信干预（网络承保动态目标引擎 [NUDGE]；N = 20），或参与注意力控制条件（N = 20），持续 20 天。通过连续加速度计测量所有参与者的身体活动。对项目使用和满意度评级进行频率分析以评估可行性和可接受性，并使用多级模型来评估功效假设。结果 绝大多数参与者 (90%) 表示对 NUDGE 计划非常或大部分感到满意​​，并将他们的享受评为高于平均水平。据估计，干预组相对于注意力对照组平均每天多花 20.84 分钟进行中等至剧烈的体育活动（β = 20.84，SE = 8.19）。探索性分析显示，干预组平均每天也减少了 82 分钟的久坐时间，尽管由于久坐时间的巨大差异，这种影响并不显着（β = -81.98，SE = 46.86）。结论 NUDGE 量身定制的短信干预是可行的、可接受的，并且在增加该样本的身体活动方面是有效的。