Objective: Consistent with the Science of Behavior Change (SOBC) experimental medicine approach, this early phase intervention development study examines the influence of an intervention strategy (exercise training) on a behavioral health outcome (exercise engagement) in the service of addressing a widespread threat to public health (physical inactivity). Method: Physically inactive participants (N = 201) were randomly assigned to one of four exercise training conditions fully crossed on intensity (moderate, vigorous) and duration (short, long). Training occurred over 16-weeks and in-bout assessments of affective response (valence) and ratings of perceived exertion (RPE) were collected during Weeks 1, 4, 8, and 16. Cardiorespiratory fitness (VO₂max) was assessed pre- or postintervention and exercise behavior was assessed at 6-months postintervention follow-up. Results: Across conditions, affective response to exercise did not change, on average, over 16-weeks. Conversely, RPE decreased slightly, on average, over time. Participants completing vigorous intensity exercise reported more negatively valenced affective response and higher RPE, on average, across weeks. Greater total exercise volume completed and greater change in VO₂max were associated with more negatively valenced affective response, on average. Baseline affective response scores were positively associated with exercise minutes at follow-up; however, average affective response scores across the intervention were not associated with minutes of exercise at follow-up. Conclusions: Affective response to exercise did not become more positive in valence over time as a function of training volume or change in VO₂max. Implications for translating these findings to inform future intervention development efforts are discussed. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

中文翻译：

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在一项为期16周的随机对照试验（RCT）中，对运动情感反应的纵向变化进行建模。

目的：与行为改变科学（SOBC）实验医学方法一致，该早期干预发展研究研究了干预策略（运动训练）对行为健康结果（运动参与）的服务，以应对广泛的威胁对公共健康（缺乏运动）。方法：将无运动能力的参与者（N = 201）随机分配到强度（中度，剧烈）和持续时间（短，长）完全交叉的四种运动训练条件之一。培训进行了16周，并在第1、4、8和16周收集了情感反应（效价）和感知劳累等级（RPE）的入内评估。干预前或干预后评估心脏呼吸适应度（VO 2 max），干预后6个月评估运动行为。结果：在所有情况下，平均超过16周，对运动的情感反应都没有改变。相反，随着时间的流逝，RPE平均略有下降。参加剧烈运动的参与者平均在整个星期内都表现出较差的情感反应和更高的RPE。平均而言，完成更大的总运动量和最大VO 2 max的变化与更负价的情感反应有关。基线情感反应评分与随访时的运动时间呈正相关。但是，干预期间的平均情感反应得分与随访时的运动时间无关。结论：随着训练时间或VO 2 max的变化，对运动的情感反应在效价上不会随着时间的推移变得更加积极。讨论了翻译这些发现以为将来的干预开发工作提供参考的含义。（PsycInfo数据库记录（c）2020 APA，保留所有权利）。