Department of Kinesiology and Physical Education, McGill University, Montreal, QC, H2W 1S4 Canada.
Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, ON, M5S 2W6 Canada.
Prev Med. 2014 Mar;60:115-20. doi: 10.1016/j.ypmed.2013.12.029. Epub 2014 Jan 4.
Sedentary behavior (SB) is distinct from physical inactivity. Children's guidelines recommend ≤2h/day screen time and ≥60min/day moderate-to-vigorous physical activity (MVPA). This study describes SB in children at elevated risk of obesity, including the possibility of high SB in otherwise active children.
Participants were 534 children from Quebec, Canada, aged 8-10years with ≥1 obese parent in 2005-2008. SB and MVPA were measured by accelerometer and specific SBs by self-report, and height and weight were directly measured.
Overweight/obese children were significantly more sedentary overall and reported higher screen time than normal weight children. About 19% of boys and 46% of girls met screen time but not PA guidelines; 28% of boys and 5% of girls met PA but not screen time guidelines. About 46% of overweight/obese children met neither guideline (32% normal weight); only 5% overweight/obese children met both (21% normal weight). Reported behaviors contributed 60%-80% of total SB time; the most sedentary children had the most unaccounted for SB time.
Overweight/obese children are more sedentary overall and report higher screen time than normal weight children. Public health efforts targeting PA and SB in children must consider sex and weight status while being cognizant that being sufficiently active is not exclusive of high levels of SB.
久坐行为（SB）与身体不活动不同。儿童指南建议每天屏幕时间≤2 小时，每天进行≥60 分钟的中等到剧烈的身体活动（MVPA）。本研究描述了肥胖风险较高的儿童的 SB 情况，包括在其他方面活跃的儿童也可能存在高 SB 的可能性。
参与者是 2005-2008 年加拿大魁北克的 534 名 8-10 岁儿童，其父母中有≥1 人肥胖。通过加速度计测量 SB 和 MVPA，并通过自我报告测量特定的 SB，直接测量身高和体重。
超重/肥胖儿童总体上更加久坐，报告的屏幕时间比正常体重儿童高。约 19%的男孩和 46%的女孩符合屏幕时间但不符合 PA 指南；28%的男孩和 5%的女孩符合 PA 但不符合屏幕时间指南。约 46%的超重/肥胖儿童不符合任何指南（正常体重为 32%）；只有 5%的超重/肥胖儿童符合两项指南（正常体重为 21%）。报告的行为占 SB 总时间的 60%-80%；最久坐的儿童的 SB 时间未被充分记录。
超重/肥胖儿童总体上更加久坐，报告的屏幕时间比正常体重儿童高。针对儿童 PA 和 SB 的公共卫生工作必须考虑性别和体重状况，同时要意识到，足够活跃并不排除高水平的 SB。
