Dept of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, CA, USA.
J Phys Act Health. 2013 Jul;10(5):656-68. doi: 10.1123/jpah.10.5.656. Epub 2012 Sep 18.
The goals of this study were to examine 1) longitudinal trajectories of energy expenditure from recreational physical activity (PA) in postmenopausal women, 2) whether women who belong to different PA trajectories engage in different types of PA, and 3) whether baseline sociodemographic, health, psychosocial, and lifestyle characteristics predict membership in PA trajectories.
Women from the Women's Health Initiative Observational Study with baseline PA data (n = 92,629) were included. Physical activity, measured via self-report 6 times over 8 years, was converted to MET hr/wk for analysis. Latent growth curve mixture models and latent profile models were used to analyze longitudinal PA trajectories and cross-sectional PA composition, respectively.
Three distinct, stable PA trajectories (highly, moderately, and minimally active) were identified with nearly 75% of the women classified as minimally active (≤ 8 MET-hr/wk). The majority of women who were at least moderately active engaged in a balanced combination of walking, moderate, and vigorous PA. Sociodemographic characteristics such as income, education, and past vigorous PA were predictive of PA trajectory, as were some health status indicators (eg, body mass index), but not health related quality of life.
Self-reported PA is largely stable across nearly a decade of follow-up in postmenopausal women.
本研究旨在：1）考察绝经后女性休闲体力活动（PA）能量消耗的纵向轨迹；2）属于不同 PA 轨迹的女性从事不同类型的 PA；3）基线社会人口学、健康、心理社会和生活方式特征是否预测 PA 轨迹的参与。
纳入了有基线 PA 数据的妇女健康倡议观察性研究的女性（n=92629）。通过 8 年期间 6 次自我报告测量的 PA，转换为 MET 小时/周进行分析。使用潜在增长曲线混合模型和潜在剖面模型分别分析纵向 PA 轨迹和横断面 PA 构成。
确定了三种不同且稳定的 PA 轨迹（高度活跃、中度活跃和低度活跃），近 75%的女性被归类为低度活跃（≤8 MET-hr/wk）。至少中度活跃的大多数女性从事了步行、适度和剧烈 PA 的平衡组合。社会人口学特征（如收入、教育和过去的剧烈 PA）以及一些健康状况指标（如体重指数）可预测 PA 轨迹，但健康相关生活质量不可预测。
在绝经后女性近十年的随访中，自我报告的 PA 基本稳定。
