Cheng Oi Ying, Yam Claudia Long Ying, Cheung Ning Sum, Lee Pui Lo Penny, Ngai Ming Chu, Lin Chung-Ying
Am J Health Behav. 2019 May 1;43(3):569-581. doi: 10.5993/AJHB.43.3.11.
The evidence for Theory of Planned Behavior (TPB) on explaining weight-reduction behaviors (healthy eating [HE] and physical activity [PA]) is inconsistent. Meanwhile, research has acknowledged that the role of weight-related self-stigma may influence HE and PA engagement. We proposed and evaluated an extended TPB model incorporating weight-related self-stigma. Through convenience sampling, we assessed the TPB factors of university students with overweight (65 men and 39 women). The students completed several questionnaires assessing subjective norms (from normative beliefs), attitudes, perceived behavioral control (from control beliefs), and behavioral intentions (on HE and PA). They also responded to questions regarding their weight-related self-stigma, HE (measured using a questionnaire on maladaptive eating behaviors), and PA. The extended TPB partially explained HE and PA behaviors: weight-related self-stigma was significantly and directly associated with both HE (β = 0.27; p = .001) and PA (β = -0.30; p = .006). Perceived behavioral control was only indirectly associated with PA through intention. Behavioral intention was significantly associated with PA (β = 0.26; p = .044), but not with HE (β = -0.001; p = .99). Our findings partially support the extended TPB; however, our findings should be interpreted with caution because of the poor generalizability caused by our convenience sampling method.
计划行为理论（TPB）在解释减肥行为（健康饮食[HE]和体育活动[PA]）方面的证据并不一致。与此同时，研究已经认识到与体重相关的自我污名的作用可能会影响健康饮食和体育活动的参与度。我们提出并评估了一个纳入与体重相关的自我污名的扩展TPB模型。通过便利抽样，我们评估了超重大学生（65名男性和39名女性）的TPB因素。学生们完成了几份问卷，评估主观规范（来自规范信念）、态度、感知行为控制（来自控制信念）和行为意图（关于健康饮食和体育活动）。他们还回答了有关其与体重相关的自我污名、健康饮食（使用关于适应不良饮食行为的问卷进行测量）和体育活动的问题。扩展的TPB部分解释了健康饮食和体育活动行为：与体重相关的自我污名与健康饮食（β = 0.27；p = .001）和体育活动（β = -0.30；p = .006）均显著且直接相关。感知行为控制仅通过意图与体育活动间接相关。行为意图与体育活动显著相关（β = 0.26；p = .044），但与健康饮食无关（β = -0.001；p = .99）。我们的研究结果部分支持扩展的TPB；然而，由于我们的便利抽样方法导致的可推广性较差，我们的研究结果应谨慎解释。
