Comparing a recommendation for self-paced versus moderate intensity physical activity for midlife adults: Rationale and design.
Comparing a recommendation for self-paced versus moderate intensity physical activity for midlife adults: Rationale and design.
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比较中年成年人自定进度与中等强度身体活动的建议：基本原理和设计。
DOI：
10.1016/j.cct.2023.107169
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发表时间：
2023
影响因子：
2.2
通讯作者：
Williams,DavidM
中科院分区：
文献类型：
--
作者：
Bohlen,LaurenConnell;LaRowe,LisaR;Dunsiger,ShiraI;Dionne,Laura;Griffin,Elizabeth;Kim,AlisonE;Marcus,BessH;Unick,Jessica;Wu,Wen-Chih;Williams,DavidM
美国现行指南建议成年人每周进行 150 分钟的中等强度体力活动 (PA)、75 分钟的高强度体力活动或某种等效的组合。然而，只有不到一半的美国成年人达到了这一目标，超重或肥胖的成年人的比例甚至更小。此外，45-50 岁后，常规 PA 会下降。先前的研究表明，国家指南的转变强调自我选择强度（即自定进度）的 PA，而不是规定的中等强度 PA，可能会导致更好地遵守 PA 计划，特别是对于超重或肥胖的中年成年人。本文提出了一项基于现场的随机对照试验方案，该方案测试了以下假设：当明确建议在超重或肥胖的中年（50-64 岁）成年人 (N=240) 中自行制定 PA 计划而不是中等强度时，PA 计划的依从性会得到改善。所有参与者都接受为期 12 个月的干预，旨在帮助他们克服常规 PA 的障碍，并随机分配到自定进度或规定的中等强度 PA。主要结果是通过加速度计测量的 PA 总量（按强度分钟数）。次要结果包括自我报告的分钟/周 PA 和体重变化。此外，利用生态瞬时评估，我们检查了治疗效果的假定中介因素。我们假设自定进度的 PA 会导致对 PA 更积极的情感反应、更多的自主意识以及在 PA 期间更低的感知用力，从而更大程度地增加 PA 行为。研究结果将对超重或肥胖的中年成年人的 PA 强度建议产生直接影响。
Current U.S. guidelines recommend that adults obtain 150 min per week of moderate intensity physical activity (PA), 75 min of vigorous intensity PA, or some equivalent combination. However, less than half of U.S. adults reach this goal, with the proportion even smaller among adults with overweight or obesity. Moreover, regular PA declines after age 45–50. Previous research suggests a shift in national guidelines to emphasize PA of a self-selected intensity (i.e., self-paced), instead of prescribed moderate intensity PA, may result in better adherence to PA programs, particularly among midlife adults with overweight or obesity. The present paper presents the protocol for a field-based RCT testing the hypothesis that adherence to PA programs is improved when PA is explicitly recommended to be self-paced rather than prescribed at moderate intensity among midlife (ages 50–64) adults (N= 240) with overweight or obesity. All participants receive a 12-month intervention designed to help them overcome barriers to regular PA and are randomly assigned to either self-paced or prescribed moderate intensity PA. The primary outcome is total volume of PA (minutes by intensity) as measured by accelerometry. Secondary outcomes include self-reported min/week of PA and changes in bodyweight. Additionally, using ecological momentary assessment, we examine putative mediators of treatment effects. We hypothesize self-paced PA will lead to a more positive affective response to PA, more perceived autonomy, and lower perceived exertion during PA, and thus greater increases in PA behavior. Findings will have direct implications for PA intensity recommendations among midlife adults with overweight or obesity.