Research Center in Physical Activity and Health (Room 48), Center of Sports, Campus João David Ferreira Lima Florianópolis, Santa Catarina State 88040-900, Brazil.
Research Center in Physical Activity and Health, Federal University of Santa Catarina.
J Sch Health. 2019 Feb;89(2):99-105. doi: 10.1111/josh.12716.
Sedentary behavior (SB) is related to unhealthy outcomes and is performed in many contexts, including school. The aim of this study was to identify sociodemographic, biological, and psychosocial correlates of SB performed at school in a sample of adolescents.
Adolescents provided information regarding sex, age, socioeconomic status, and psychosocial variables related to physical activity (self-efficacy, attitudes, perception of school environment, peer and parental support). Body fat was estimated using skinfolds, and maximum aerobic capacity with a 20 m shuttle run. Adolescents wore accelerometers and SB performed during class time, physical education (PE) classes, and recesses was estimated.
Adolescents (N = 567, 53% female, 12.9 ± 5.3 years old) spent 67% of class time, 41% of PE classes, and 41% of recesses in SB. Girls spent more time in SB, and age was negatively associated with SB. Body fat was positively associated with SB in class time and PE classes. Peer support for physical activity was negatively associated with SB in class time, whereas attitudes related to physical activity were negatively associated with SB during PE classes and recesses.
Adolescents spend long periods in SB at school, even during opportunities to be active like PE classes and recesses.
久坐行为（SB）与不健康的结果有关，并在许多环境中进行，包括学校。本研究的目的是在青少年样本中确定与在学校进行的 SB 相关的社会人口学、生物学和心理社会因素。
青少年提供了有关性别、年龄、社会经济地位以及与体育活动相关的心理社会变量（自我效能感、态度、对学校环境的感知、同伴和父母支持）的信息。使用皮褶厚度估计体脂肪，使用 20 米穿梭跑测试最大有氧能力。青少年佩戴加速度计，估计课堂时间、体育课和课间休息期间的 SB。
青少年（N=567，53%为女性，12.9±5.3 岁）在课堂时间、体育课和课间休息期间分别有 67%、41%和 41%的时间处于 SB 状态。女孩在 SB 上花费的时间更多，年龄与 SB 呈负相关。体脂肪与课堂时间和体育课上的 SB 呈正相关。同伴对体育活动的支持与课堂时间的 SB 呈负相关，而与体育课和课间休息期间的 SB 相关的体育活动态度则呈负相关。
青少年在学校的 SB 时间很长，即使在体育课和课间休息等活跃机会中也是如此。
