Stehr Paula, Rossmann Constanze, Kremer Tabea, Geppert Johanna
Department of Media and Communication Science, University of Erfurt, 99089 Erfurt, Germany.
Int J Environ Res Public Health. 2021 May 27;18(11):5759. doi: 10.3390/ijerph18115759.
Based on the theory of planned behavior (TPB), augmented by the concept of self-concordance (derived from self-determination theory, SDT), we conducted a study to identify the key determinants of physical activity in older adults. We applied structural equation modeling of telephone survey data from a random sample of adults aged 65 years and older living in Germany ( = 865). Relations of attitude, subjective norms, and perceived behavioral control (PBC) with intention strength and self-concordance of intention to be physically active were tested. Habit strength was analyzed as a moderator. Data analysis showed this model to be well-suited for explaining the intention to be physically active-especially for people with a weak habit. The influence of TPB components on intention would have been underestimated if we had investigated intention strength only, without considering the self-concordance of intention. While attitude and PBC had positive relations with a strong and self-determined intention, the subjective norm showed no relation with intention strength but, rather, with non-self-determined regulation forms. We conclude that the combined model provides a better theoretical foundation from which to explain physical activity intentions than does just one of the theories.
基于计划行为理论（TPB），并辅以自我一致性概念（源自自我决定理论，SDT），我们开展了一项研究，以确定老年人身体活动的关键决定因素。我们对来自德国年龄在65岁及以上成年人随机样本的电话调查数据进行了结构方程建模（n = 865）。测试了态度、主观规范和感知行为控制（PBC）与身体活动意图强度及意图的自我一致性之间的关系。将习惯强度作为调节变量进行了分析。数据分析表明，该模型非常适合解释身体活动意图，尤其是对于习惯较弱的人。如果我们仅研究意图强度而不考虑意图的自我一致性，TPB各成分对意图的影响就会被低估。虽然态度和PBC与强烈且自我决定的意图呈正相关，但主观规范与意图强度无关，而是与非自我决定的调节形式有关。我们得出结论，与仅一种理论相比，组合模型为解释身体活动意图提供了更好的理论基础。
