College of Nursing, University of South Carolina, 1601 Greene Street, Suite 302B, Columbia, 29208, SC, United States.
School of Public Health, Brown University, Providence, United States.
J Behav Med. 2023 Oct;46(5):745-756. doi: 10.1007/s10865-023-00402-0. Epub 2023 Mar 9.
To explore the theoretical constructs that functioned as mediators of interventions for moderate-to-vigorous physical activity (MVPA) maintenance among breast cancer survivors.
161 survivors were randomized into 3 groups: Reach Plus, Reach Plus Message or Reach Plus Phone. All participants received a 3-month theory-based intervention delivered by volunteer coaches. During months 4-9, all participants monitored their MVPA and received feedback reports. Additionally, Reach Plus Message received weekly text/email messages and Reach Plus Phone received monthly calls from their coaches. Assessments of weekly MVPA minutes and theoretical constructs (self-efficacy, social support, physical activity [PA] enjoyment and PA barriers) were obtained at baseline, 3, 6, 9 and 12-months.
Using a multiple mediator analysis with a product of coefficients approach, we examined mechanisms associated with between-group differences over time in weekly MVPA minutes.
Self-efficacy mediated effects of Reach Plus Message vs. Reach Plus at 6 (ab = 16.99) and 9 M (ab = 27.45); social support mediated effects at 6 (ab = 4.86), 9 (ab = 14.30) and 12 M (ab = 6.18). Self-efficacy mediated effects of Reach Plus Phone vs. Reach Plus at 6 (ab = 18.76), 9 (ab = 28.93) and 12 M (ab = 18.18). Social support mediated effects of Reach Plus Phone vs. Reach Plus Message at 6 (ab=-5.50) and 9 M (ab=-13.20); PA enjoyment mediated effects at 12 M (ab=-3.63).
PA maintenance efforts should focus on strengthening breast cancer survivors' self-efficacy and obtaining social support.The trial was registered at ClinicalTrials.Gov: NCT02694640 (Feb. 26, 2016).
探讨在乳腺癌幸存者中维持中等到剧烈体力活动（MVPA）的干预措施所依据的理论结构。
161 名幸存者被随机分为 3 组：Reach Plus、Reach Plus 消息或 Reach Plus 电话。所有参与者都接受了由志愿者教练提供的为期 3 个月的基于理论的干预。在第 4-9 个月期间，所有参与者都监测了他们的 MVPA 并收到了反馈报告。此外，Reach Plus 消息每周收到短信/电子邮件，Reach Plus 电话每月收到教练的电话。在基线、3、6、9 和 12 个月时评估每周 MVPA 分钟数和理论结构（自我效能、社会支持、体力活动[PA]享受和 PA 障碍）。
使用乘积系数方法的多重中介分析，我们研究了与每周 MVPA 分钟数随时间的组间差异相关的机制。
自我效能在 Reach Plus 消息与 Reach Plus 之间的 6 个月（ab=16.99）和 9 个月（ab=27.45）时起中介作用；社会支持在 6 个月（ab=4.86）、9 个月（ab=14.30）和 12 个月（ab=6.18）时起中介作用。Reach Plus 电话与 Reach Plus 之间的自我效能在 6 个月（ab=18.76）、9 个月（ab=28.93）和 12 个月（ab=18.18）时起中介作用。Reach Plus 电话与 Reach Plus 消息之间的社会支持在 6 个月（ab=-5.50）和 9 个月（ab=-13.20）时起中介作用；PA 享受在 12 个月（ab=-3.63）时起中介作用。
PA 维持工作应侧重于增强乳腺癌幸存者的自我效能感并获得社会支持。该试验在 ClinicalTrials.Gov 上注册：NCT02694640（2016 年 2 月 26 日）。
