Garcia Jeanette M, Agaronov Alen, Sirard John R, Whaley Diane, Rice David J, Weltman Arthur
J Phys Act Health. 2017 Mar;14(3):213-221. doi: 10.1123/jpah.2016-0035. Epub 2016 Dec 5.
Sedentary behavior (SB) increases throughout adolescence, and is associated with adverse health outcomes.
Examine psychosocial and friend influences on SB and screen time in adolescents using a mixed-methods design.
108 middle and high school students wore accelerometers to measure objective SB, completed screen time and psychosocial questionnaires, and nominated friends to complete activity questionnaires. Focus groups centered around influences on SB behavior. Regression analyses and NVivo software analyzed quantitative and qualitative data.
Screen time was associated with greater screen time enjoyment, lower self-efficacy, and friends' screen time (r = .21, P < .0001). Friends influenced whether adolescents engaged in screen time behaviors, with active friends encouraging less screen time.
Active friends influenced adolescents to engage in less SB. Interventions should place an emphasis on encouraging less screen time, and providing opportunities for adolescents and their friends to engage in activities that promote physical activity rather than SB.
久坐行为（SB）在整个青春期都会增加，并且与不良健康结果相关。
采用混合方法设计，研究心理社会因素和朋友对青少年久坐行为和屏幕使用时间的影响。
108名中学生和高中生佩戴加速度计以测量客观的久坐行为，完成屏幕使用时间和心理社会调查问卷，并指定朋友完成活动调查问卷。焦点小组围绕对久坐行为的影响展开。回归分析和NVivo软件用于分析定量和定性数据。
屏幕使用时间与更高的屏幕使用时间愉悦感、更低的自我效能感以及朋友的屏幕使用时间相关（r = 0.21，P < 0.0001）。朋友会影响青少年是否参与屏幕使用时间行为，活跃的朋友会鼓励减少屏幕使用时间。
活跃的朋友会影响青少年减少久坐行为。干预措施应着重鼓励减少屏幕使用时间，并为青少年及其朋友提供参与促进身体活动而非久坐行为的活动的机会。
