Cancer survivors are more at risk for physical and psychological health problems than the general population. Regular aerobic physical activity can mitigate these risks, but survivors frequently fail to engage in recommended levels of physical activity. In the present study, we propose and test a moderated-mediation model of physical activity of cancer survivors based on contextual behavioral models. First, we predict that value-based motivation is a determinant of greater aerobic physical activity in cancer survivors. Second, integrating contextual behavioral theory with recent health behavior studies, we predict that affective associations with physical activity statistically mediate the relationship between value-based motivation and physical activity. Finally, we predict that internal barriers (e.g., psychological inflexibility) that impede survivors’ ability to engage in physical activity moderate the link between affective associations and physical activity. To test these predictions, 108 cancer survivors completed self-report measures assessing value-based motivation, affective associations with physical activity, psychological inflexibility, and physical activity in a cross-sectional study. The results supported the moderated-mediation model. Specifically, value-based motivation significantly predicted physical activity estimates and positive affective associations statistically mediated this relationship. Further, the link between affective associations and physical activity estimates was moderated by psychological inflexibility. This initial study provides insights into the variables and processes involved in the engagement of aerobic physical activity in cancer survivors and suggests the relevance of acceptance-based behavioral treatments for this population.

癌症幸存者比普通人群更容易遭受身体和心理健康问题的威胁。定期进行有氧运动可以减轻这些风险，但是幸存者经常无法进行建议的运动量。在本研究中，我们提出并测试了基于上下文行为模型的癌症幸存者身体活动的中度调解模型。首先，我们预测基于价值的动机是癌症幸存者更大的有氧体育活动的决定因素。第二，将上下文行为理论与最近的健康行为研究相结合，我们预测与体育活动的情感关联会在统计上介导基于价值的动机与体育活动之间的关系。最后，我们预测内部障碍（例如，心理上的僵化）阻碍幸存者从事体育活动的能力，缓和了情感联想与体育活动之间的联系。为了检验这些预测，在横断面研究中，有108名癌症幸存者完成了自我报告测量，评估了基于价值的动机，与体育活动，心理僵硬和体育活动的情感关联。结果支持仲裁中介模型。具体而言，基于价值的动机显着预测了体育活动估计，而积极的情感联想在统计学上介导了这种关系。另外，情感上的联想和身体活动估计之间的联系被心理上的僵化所调节。