School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada.
Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, PE, Canada.
Can J Public Health. 2020 Aug;111(4):515-522. doi: 10.17269/s41997-020-00313-6. Epub 2020 Apr 13.
To examine the four possible combinations of adherence to physical activity and screen time recommendations in adolescents and how the combinations relate to overweight and obesity.
A total of 9913 students in grades 7-12 were included in the present cross-sectional analyses. Moderate-to-vigorous physical activity (MVPA), screen time, and body mass index were self-reported. Multivariate logistic regression analysis was used to test the associations between combinations of MVPA (≥ 60 min/day [active] or < 60 min/day [inactive]) and screen time (≤ 2 h/day [not sedentary] or > 2 h/day [sedentary]) recommendations with overweight/obesity.
We found that 53.1% of students in Ontario were considered "inactive+sedentary", 23.7% were considered "inactive+not sedentary", 12.1% were considered "active+sedentary", and 11.1% were considered "active+not sedentary". Some characteristics of "active+not sedentary" students (optimal category) included younger age, male gender, white ethnicity, higher socio-economic status, optimal sleep duration, and lower prevalence of cannabis use. After adjusting for relevant covariates, the "inactive+sedentary" group was more likely to report overweight/obesity than the "active+not sedentary" group (odds ratio [OR] = 1.71, 95% confidence interval [CI] = 1.26-2.32). The "inactive+not sedentary" group was also more likely to report overweight/obesity (OR = 1.54, 95% CI 1.20-1.97) while the "active+sedentary" group was not significantly associated with overweight/obesity (OR = 1.27, 95% CI 0.88-1.83).
Children meeting both the physical activity and screen time recommendations are less likely to be classified as overweight/obese compared with any other combination. Future efforts are needed to target both MVPA and sedentary behaviour to address public health concerns such as excess weight.
研究青少年中遵循体力活动和屏幕时间建议的四种可能组合方式，以及这些组合方式与超重和肥胖的关系。
本横断面分析共纳入了 9913 名 7-12 年级的学生。采用多变量逻辑回归分析，检验了体力活动（MVPA）（≥60 分钟/天[活跃]或＜60 分钟/天[不活跃]）和屏幕时间（≤2 小时/天[不静坐]或＞2 小时/天[静坐]）建议的组合与超重/肥胖之间的关联。
我们发现，安大略省有 53.1%的学生被认为是“不活跃+静坐”，23.7%的学生被认为是“不活跃+不静坐”，12.1%的学生被认为是“活跃+静坐”，11.1%的学生被认为是“活跃+不静坐”。“活跃+不静坐”学生的一些特征（最佳类别）包括年龄较小、男性、白人、社会经济地位较高、最佳睡眠时间和较低的大麻使用率。调整相关协变量后，与“活跃+不静坐”组相比，“不活跃+静坐”组报告超重/肥胖的可能性更高（比值比[OR] 1.71，95%置信区间[CI] 1.26-2.32）。“不活跃+不静坐”组报告超重/肥胖的可能性也更高（OR 1.54，95% CI 1.20-1.97），而“活跃+静坐”组与超重/肥胖无显著相关性（OR 1.27，95% CI 0.88-1.83）。
与任何其他组合相比，同时符合体力活动和屏幕时间建议的儿童更不容易被归类为超重/肥胖。未来需要努力同时针对体力活动和久坐行为，以解决超重等公共卫生问题。
