ABSTRACT Although psycho-social interventions have been proposed to increase physical activity, variability in the degree to which physical activity is maintained still exists. The self-as-doer identity, an identity which describes an individual in terms of identification with doing a behavior, predicts physical activity and shows promise for the maintenance of health behaviors. Yet less is known about how the self-as-doer promotes physical activity. One probable mechanism of influence is by increasing confidence in overcoming barriers for physical activity. Therefore, self-efficacy for barriers in physical activity was tested as an intervening variable in the relationship between self-as-doer identity and physical activity. Participants (220 college students, Mage = 20.5, SD = 2.95) completed measures assessing barrier self-efficacy, self-as-doer identity, and physical activity behaviors. Barrier self-efficacy was a significant intervening variable for vigorous, moderate, and total physical activity, but not for walking behaviors. Higher levels of self-as-doer identity were associated with higher levels of barrier self-efficacy, which was then associated with more vigorous, moderate, and total weekly physical activity behaviors. Self-as-doer identity is associated with physical activity through its positive relationship with confidence to overcome barriers. Self-as-doer identity may be used to promote confidence in overcoming barriers to physical activity, thereby promoting greater physical activity acquisition and maintenance.

中文翻译：

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自我作为行动者的身份和身体活动：自我效能对管理身体活动障碍的中介作用

摘要 尽管已提出心理社会干预来增加身体活动，但保持身体活动的程度仍然存在差异。自我作为行动者的身份，一种描述个人对行为的认同，预测身体活动并表现出维持健康行为的承诺的身份。然而，人们对自我作为者如何促进身体活动知之甚少。一种可能的影响机制是增加克服身体活动障碍的信心。因此，身体活动障碍的自我效能被测试为自我作为行动者身份和身体活动之间关系的干预变量。参与者（220 名大学生，法师 = 20.5，SD = 2.95）完成了评估障碍自我效能的措施，自我作为行动者的身份和身体活动行为。障碍自我效能感是剧烈、适度和完全体力活动的重要干预变量，但不是步行行为。较高水平的自我作为行动者与较高水平的障碍自我效能相关，然后与更有活力、中等和每周总体育活动行为相关联。自我作为行动者的身份通过其与克服障碍的信心的积极关系与体育活动相关联。自我作为行动者的身份可用于提高克服身体活动障碍的信心，从而促进更多的身体活动获得和维持。和总的体力活动，但不适用于步行行为。较高水平的自我作为行动者与较高水平的障碍自我效能相关，然后与更有活力、中等和每周总体育活动行为相关联。自我作为行动者的身份通过其与克服障碍的信心的积极关系与体育活动相关联。自我作为行动者的身份可用于提高克服身体活动障碍的信心，从而促进更多的身体活动获得和维持。和总的体力活动，但不适用于步行行为。较高水平的自我作为行动者与较高水平的障碍自我效能相关，然后与更有活力、中等和每周总体育活动行为相关联。自我作为行动者的身份通过其与克服障碍的信心的积极关系与体育活动相关联。自我作为行动者的身份可用于提高克服身体活动障碍的信心，从而促进更多的身体活动获得和维持。自我作为行动者的身份通过其与克服障碍的信心的积极关系与体育活动相关联。自我作为行动者的身份可用于提高克服身体活动障碍的信心，从而促进更多的身体活动获得和维持。自我作为行动者的身份通过其与克服障碍的信心的积极关系与体育活动相关联。自我作为行动者的身份可用于提高克服身体活动障碍的信心，从而促进更多的身体活动获得和维持。