Jacobs University Bremen, Bremen, Germany.
Leibniz Institute for Prevention Research and Epidemiology-BIPS, Bremen, Germany.
Appl Psychol Health Well Being. 2020 Mar;12(1):77-100. doi: 10.1111/aphw.12174. Epub 2019 Jul 22.
Web-based, theory-driven interventions effectively promote older adults' physical activity. Social-cognitive mechanisms of their effect on stage of change need to be further researched.
Older adults were randomly allocated to intervention group 1 (10-week online physical activity program), intervention group 2 (same program plus activity tracker), or delayed intervention control group; n = 351 were analyzed (59.6% of originally allocated individuals). Stages of change for recommended endurance and strength training and social-cognitive predictors of physical activity were assessed using questionnaires at baseline and follow-up. Intervention effects and mediation were investigated using mixed-effects ANOVA and ordinal least squares regression.
Direct effects on stage of change were found for intervention group 1 regarding endurance training (b = 0.44, 95% confidence interval [0.15, 0.73]), and both groups regarding strength training (b = 1.02, [0.71, 1.33], b = 1.24, [0.92, 1.56]). Social-cognitive predictor changes in task self-efficacy, intention, and action planning explained intervention effect on stage of change, but not to the full extent.
The results indicate significant web-based intervention effects on physical activity stage, partly mediated by changes in task self-efficacy, intention, and action planning.
基于网络的、理论驱动的干预措施有效地促进了老年人的身体活动。需要进一步研究它们对改变阶段的社会认知机制的影响。
将老年人随机分配到干预组 1（10 周在线身体活动计划）、干预组 2（相同计划加活动追踪器）或延迟干预对照组；n = 351 人进行了分析（占最初分配人数的 59.6%）。在基线和随访时使用问卷评估推荐的耐力和力量训练的改变阶段以及身体活动的社会认知预测因素。使用混合效应 ANOVA 和有序最小二乘回归研究干预效果和中介作用。
干预组 1 对耐力训练的改变阶段有直接影响（b = 0.44，95%置信区间 [0.15，0.73]），两组对力量训练都有影响（b = 1.02，[0.71，1.33]，b = 1.24，[0.92，1.56]）。任务自我效能感、意图和行动计划的社会认知预测因素的变化解释了对改变阶段的干预效果，但并非完全如此。
结果表明，基于网络的干预措施对身体活动阶段有显著影响，部分通过任务自我效能感、意图和行动计划的变化来解释。
