Nuffield Department of Primary Care Health Sciences, University of Oxford, UK.
Br J Health Psychol. 2020 Sep;25(3):652-676. doi: 10.1111/bjhp.12436. Epub 2020 Jun 2.
To evaluate effectiveness and acceptability of a novel intervention, based on self-regulation theory, for weight loss.
A two-arm parallel group design was employed.
Adult participants with a BMI ≥ 30 kg/m and the aim to lose weight were recruited and randomized to either a control or intervention group. Both groups were asked to weigh themselves daily for eight weeks. The intervention group was encouraged to use a weight tracking app, and complete daily and weekly questionnaires to prompt action planning, reflection, and evaluation of actions. Participants chose daily actions from a menu of 53 behaviours. The primary outcome was weight change after 8 weeks, assessed using linear mixed effects models. At follow-up, 20 intervention group participants were interviewed regarding their experiences in the trial.
100 participants were recruited, and 98% were followed up at 8 weeks. Mean weight loss was -4.18 kg (SD = 3.84) in the intervention compared to -1.01 kg (SD = 2.67) in the control group; the adjusted difference was -3.20 kg (95% CI -4.49, -1.92). Participants rated the intervention's usefulness as 8.25 (SD = 2.04) on a scale from 1 to 10. Adherence was a significant independent predictor of weight loss success (-1.54 kg per one SD, 95% CI -2.16, -0.93), but not a mediator of the intervention effect. Participants reported that the intervention enabled them to experiment with and identify effective weight loss actions.
Guiding participants through the self-regulation process was feasible, acceptable to participants, and led to significantly greater short-term weight loss than unguided self-weighing.
评估基于自我调节理论的新型干预措施在减肥方面的效果和可接受性。
采用双臂平行组设计。
招募 BMI≥30kg/m2且有减肥意愿的成年参与者，并将其随机分配至对照组或干预组。两组均被要求在八周内每天称重。干预组被鼓励使用体重跟踪应用程序，并完成每日和每周的问卷，以提示行动计划、反思和评估行动。参与者从 53 种行为的菜单中选择每日行为。主要结局指标是 8 周后的体重变化，采用线性混合效应模型进行评估。在随访时，对 20 名干预组参与者进行了关于他们在试验中的经验的访谈。
共招募了 100 名参与者，98%的参与者在 8 周时得到了随访。干预组的平均体重减轻量为-4.18kg（SD=3.84），而对照组为-1.01kg（SD=2.67）；调整后的差异为-3.20kg（95%CI-4.49，-1.92）。参与者对干预措施的有用性评分平均为 8.25（SD=2.04），评分范围为 1 到 10。依从性是体重减轻成功的显著独立预测因素（每增加一个标准差，体重减轻 1.54kg，95%CI-2.16，-0.93），但不是干预效果的中介因素。参与者报告称，该干预措施使他们能够尝试并确定有效的减肥措施。
指导参与者完成自我调节过程是可行的、被参与者接受的，并导致短期体重减轻显著大于未经指导的自我称重。
