Department of Aging and Geriatric Research, College of Medicine, University of Florida, Gainesville.
Department of Health and Exercise Science, Wake Forest University, Winston-Salem, North Carolina.
J Gerontol B Psychol Sci Soc Sci. 2018 Oct 10;73(8):1501-1513. doi: 10.1093/geronb/gbx051.
To investigate whether baseline social participation modifies the effect of a long-term structured physical activity (PA) program on major mobility disability (MMD).
1,635 sedentary adults (70-89 years) with physical limitations were randomized to either a structured PA or health education (HE) intervention. Social participation was defined categorically at baseline. High social participation was defined as attending organized group functions at least once per week and visiting with noncohabitating friends and family ≥7 hr per week. Anything less was considered limited social participation. Participants performed a standardized walking test at baseline and every 6 months for up to 42 months. MMD was defined as the loss in the ability to walk 400 m.
There was a significant intervention by social participation interaction (p = .003). Among individuals with high levels of social participation, those randomized to PA had significantly lower incidence of MMD (hazard ratio [HR], 0.43 [95% confidence interval (CI), 0.27-0.68]; p < .01) than those randomized to HE. Individuals with limited social participation showed no mobility benefit of the PA intervention when compared with their HE counterparts (HR, 0.92 [95% CI, 0.77-1.11]; p = .40).
Our findings suggest that baseline social participation is an important factor for the success of a PA intervention aimed at delaying mobility disability.
研究基线社会参与是否会改变长期结构化体育活动（PA）计划对主要移动障碍（MMD）的影响。
1635 名久坐的身体受限成年人（70-89 岁）被随机分配到结构化 PA 或健康教育（HE）干预组。基线时社会参与被分类定义。高社会参与被定义为每周至少参加一次有组织的团体活动，每周与非同居的朋友和家人至少有 7 小时的交往。任何低于此标准的都被认为是有限的社会参与。参与者在基线和每 6 个月进行一次标准化步行测试，最长可达 42 个月。MMD 的定义是丧失行走 400 米的能力。
干预与社会参与之间存在显著的相互作用（p =.003）。在社会参与水平较高的个体中，与随机分配到 HE 组相比，随机分配到 PA 组的个体 MMD 的发生率显著降低（危险比[HR]，0.43[95%置信区间[CI]，0.27-0.68]；p <.01）。与 HE 对照组相比，社会参与受限的个体没有从 PA 干预中获得任何移动能力的益处（HR，0.92[95% CI，0.77-1.11]；p =.40）。
我们的发现表明，基线社会参与是一项旨在延缓移动障碍的 PA 干预成功的重要因素。
