Department of Population Medicine, Center for Healthcare Research in Pediatrics, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA.
Environmental Influences on Child Health Outcomes (ECHO), National Institutes of Health, Office of Director, Rockville, MD, USA.
Pediatr Res. 2018 Jul;84(1):50-56. doi: 10.1038/s41390-018-0024-x. Epub 2018 May 23.
We sought to identify regional and seasonal variation in not meeting physical activity (PA) recommendations of ≥60 min a day of moderate-to-vigorous PA (MVPA) and 3 h of vigorous PA per week (VPA) in a longitudinal cohort of United States (US) adolescents.
Participants in the Growing Up Today Study 2, a prospective study of 10,918 adolescents, self-reported season-specific weekly hours of MVPA and VPA from 2004 through 2011. To assess variation in PA by climate, we grouped the contiguous US into nine climatically consistent geographic regions. We also examined MVPA and VPA by season, sex, ethnicity, weight status, and age group.
The majority (85%) of adolescents did not meet the MVPA recommendation, and 91% did not meet the VPA recommendation, for one or more seasons over the four study years. Across all climate regions, adolescents were two times more likely to not meet the MVPA recommendation during the winter compared to summer (odds ratio 2.02, 95% confidence interval: 1.96-2.08).
Regardless of climate region, gender, ethnicity, or age group, adolescents were more likely not to meet MVPA or VPA recommendations in the winter than the summer. Adolescents may benefit from interventions aimed at increasing PA in the winter.
我们试图确定美国青少年的一项纵向队列研究中，每天进行≥60 分钟的中度到剧烈体力活动（MVPA）和每周 3 小时剧烈体力活动（VPA），以及每周 3 小时剧烈体力活动（VPA）的建议不达标，存在区域性和季节性差异。
参与今日成长研究 2 期的是 10918 名青少年的前瞻性研究，他们在 2004 年至 2011 年期间按季节报告了每周特定时间的 MVPA 和 VPA。为了评估气候对体力活动的影响，我们将美国大陆分为九个气候一致的地理区域。我们还检查了不同季节、性别、种族、体重状况和年龄组的 MVPA 和 VPA。
大多数（85%）青少年在四个研究年的一个或多个季节中未达到 MVPA 建议，91%的青少年未达到 VPA 建议。在所有气候区，青少年在冬季比夏季更有可能不满足 MVPA 建议（比值比 2.02，95%置信区间：1.96-2.08）。
无论气候区、性别、种族或年龄组如何，青少年在冬季不满足 MVPA 或 VPA 建议的可能性都高于夏季。青少年可能受益于旨在增加冬季体育活动的干预措施。
