This study aimed to identify latent moderate-to-vigorous intensity physical activity (MVPA) and sedentary behavior (SB) trajectories in older adults participating in a randomized intervention trial and to explore associations with baseline social-cognitive predictors. Data were assessed at baseline (T0, participants were inactive or had recently become active), after a ten-week physical activity intervention (T1), and a second 24-week intervention phase (T2). Latent class growth analysis was used on accelerometer-assessed weekly MVPA and daily SB, respectively (n = 215 eligible participants). Activity changes within trajectory classes and baseline social-cognitive predictor differences between trajectory classes were analyzed. A “stable insufficient MVPA” (n = 197, p for difference in MVPA level at T0 and T2 (pT0-T2) = .789, effect size (Cohen’s d) = .03) and a “stable high MVPA” trajectory (n = 18, pT0-T2 = .137, d = .39), as well as a “slightly decreasing high SB” (n = 63, p for difference in SB (pT0-T2) = .022, d = .36) and a “slightly increasing moderate SB” trajectory (n = 152, pT0-T2 = .019, d = .27) emerged. Belonging to the “stable high MVPA” trajectory was associated with higher action planning levels compared to the “stable insufficient MVPA” trajectory (M = 5.46 versus 4.40, d = .50). Belonging to the “decreasing high SB” trajectory was associated with higher action self-efficacy levels compared to the “increasing moderate SB” trajectory (M = 5.27 versus 4.72, d = .33). Change occurred heterogeneously in latent (not directly observed) subgroups, with significant positive trajectories only observed in the highly sedentary. German Registry of Clinical Trials, DRKS00016073 , Registered 10 January 2019.

中文翻译：

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老年人参与体育活动干预期间不同的体育活动和久坐行为轨迹：潜在类别增长分析


本研究旨在确定参与随机干预试验的老年人潜在的中等到高强度体力活动（MVPA）和久坐行为（SB）轨迹，并探索与基线社会认知预测因素的关联。在基线（T0，参与者不活动或最近变得活跃）、十周体力活动干预（T1）和第二个 24 周干预阶段（T2）后评估数据。潜在班级增长分析分别用于加速计评估的每周 MVPA 和每日 SB（n = 215 名合格参与者）。分析了轨迹类别内的活动变化以及轨迹类别之间的基线社会认知预测差异。 “稳定的不足 MVPA”（n = 197，p 表示 T0 和 T2 处 MVPA 水平的差异 (pT0-T2) = .789，效应大小 (Cohen's d) = .03）和“稳定的高 MVPA”轨迹 (n = 18，pT0-T2 = .137，d = .39)，以及“略微降低的高 SB”（n = 63，p 表示 SB 差异 (pT0-T2) = .022，d = .36）出现了“略微增加的中等 SB”轨迹（n = 152，pT0-T2 = .019，d = .27）。与“稳定的不足 MVPA”轨迹相比，属于“稳定的高 MVPA”轨迹与更高的行动计划水平相关（M = 5.46 与 4.40，d = .50）。与“中等 SB 增加”轨迹相比，“高 SB 减少”轨迹与更高的行动自我效能水平相关（M = 5.27 与 4.72，d = .33）。潜在（未直接观察到）亚组中发生的变化是异质的，仅在高度久坐的人群中观察到显着的正向轨迹。德国临床试验注册中心，DRKS00016073，于 2019 年 1 月 10 日注册。