Kornides Melanie L, Rimm Eric B, Chavarro Jorge E, Gillman Matthew W, Rosner Bernard, Field Alison E
1 Department of Population Medicine, Harvard Pilgrim Health Care Institute , Harvard Medical School, Boston, MA.
2 Department of Nutrition, Harvard T.H. Chan School of Public Health , Boston, MA.
Child Obes. 2018 Jan;14(1):33-40. doi: 10.1089/chi.2017.0118. Epub 2017 Sep 5.
Few longitudinal studies have examined seasonal variation in meeting physical activity (PA) recommendations in association with incident overweight among adolescents.
We assessed self-reported, season-specific PA among 12,949 adolescents in two US cohorts (Growing Up Today Studies 1 and 2). We examined the relationship between the number of seasons per year that adolescents met the recommended amount of moderate-to-vigorous physical activity (MVPA) and vigorous physical activity (VPA), respectively, and the development of incident overweight at the next survey period. The sex-specific analyses controlled for follow-up time, survey month, age, race/ethnicity, sexual maturation, television viewing, region of the country, and intakes of sugar-sweetened beverages and fried foods away from home.
About one-third (34%) of adolescents met the MVPA recommendation of 60 minutes/day, and one-quarter (24%) the VPA recommendation of 3 hours/week, for four seasons of the baseline year. The risk of becoming overweight was 23% (95% confidence interval [CI]: 5%-45%) higher for girls who met the MVPA recommendation for 2 (vs. 4) seasons/year. The risk was similar for girls who met the recommendation for 1 (vs. 4) season/year (odds ratio = 1.23, 95% CI: 1.05-1.44). The number of seasons each year boys met the MVPA recommendation, or girls or boys met the VPA recommendation, was not associated with an increased risk of incident overweight.
Meeting the MVPA recommendation for 1 or 2 (vs. 4) seasons/year is related to higher risk of becoming overweight among adolescent girls but not boys. Interventions to increase PA levels each season may contribute to overweight prevention efforts among girls.
很少有纵向研究考察青少年达到身体活动（PA）建议水平的季节性变化与超重发生率之间的关系。
我们在美国的两个队列（今日成长研究1和2）中的12949名青少年中评估了自我报告的特定季节的PA情况。我们分别考察了青少年每年达到中度至剧烈身体活动（MVPA）和剧烈身体活动（VPA）建议量的季节数与下一个调查期超重发生率之间的关系。按性别进行的分析控制了随访时间、调查月份、年龄、种族/族裔、性成熟度、看电视时间、所在地区以及外出摄入含糖饮料和油炸食品的情况。
在基线年份的四个季节中，约三分之一（34%）的青少年达到了每天60分钟的MVPA建议量，四分之一（24%）的青少年达到了每周3小时的VPA建议量。每年达到MVPA建议量2个季节（而非4个季节）的女孩超重风险高23%（95%置信区间[CI]：5%-45%）。每年达到建议量1个季节（而非4个季节）的女孩超重风险与之相似（比值比=1.23，95%CI：1.05-1.44）。男孩每年达到MVPA建议量的季节数，或女孩或男孩达到VPA建议量的季节数，与超重发生率增加无关。
每年达到MVPA建议量1或2个季节（而非4个季节）与青春期女孩而非男孩超重风险较高有关。每个季节增加PA水平的干预措施可能有助于预防女孩超重。
