Center of Sport and Health Sciences, University of Iceland, Reykjavik, Iceland.
Diabetes, Endocrinology and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, United States of America.
PLoS One. 2018 Apr 26;13(4):e0196286. doi: 10.1371/journal.pone.0196286. eCollection 2018.
Few studies have explored the potential interrelated associations of screen time and physical activity with mental health in youth, particularly using objective methods. We examined cross-sectional associations of these variables among Icelandic adolescents, using objective and subjective measurements of physical activity.
Data were collected in the spring of 2015 from 315 tenth grade students (mean age 15.8 years) in six elementary schools in metropolitan Reykjavík, Iceland. Participants reported, via questionnaire, on demographics, weekly frequency of vigorous physical activity, daily hours of screen time and mental health status (symptoms of depression, anxiety and somatic complaints, self-esteem and life satisfaction). Total physical activity was measured over one week with wrist-worn accelerometers. Body composition was determined by DXA-scanning. Poisson regression analysis was used to explore independent and interactive associations of screen time and physical activity with mental health variables, adjusting for gender, body fat percentage and maternal education.
Less screen time (below the group median of 5.3 h/day) and more frequent vigorous physical activity (≥4x/week) were each associated with reporting fewer symptoms of depression, anxiety, low self-esteem, and life dissatisfaction. No significant associations were observed between objectively measured physical activity and mental health outcomes. Interactive regression analysis showed that the group reporting both less screen time and more frequent vigorous physical activity had the lowest risk of reporting symptoms of depression, anxiety, low self-esteem, and life dissatisfaction.
Reports of less screen time and more frequent vigorous physical activity were associated with lower risk of reporting mental health problems among Icelandic adolescents. Those who reported a combination of engaging in less screen time and more frequent vigorous physical activity had the lowest risk, suggesting a synergistic relationship between the two behaviors on mental health outcomes. Our results support guiding youth towards more active and less sedentary/screen-based lifestyle.
很少有研究探索屏幕时间和身体活动与青少年心理健康之间的潜在相互关联，特别是使用客观方法。我们使用身体活动的客观和主观测量方法，检查了冰岛青少年的这些变量的横断面关联。
2015 年春季，从雷克雅未克大都市的六所小学的 315 名十年级学生（平均年龄 15.8 岁）中收集了数据。参与者通过问卷报告了人口统计学信息、剧烈身体活动的每周频率、每日屏幕时间和心理健康状况（抑郁、焦虑和躯体抱怨症状、自尊和生活满意度）。使用腕戴式加速度计在一周内测量总身体活动量。通过 DXA 扫描确定身体成分。使用泊松回归分析来探索屏幕时间和身体活动与心理健康变量的独立和交互关联，同时调整性别、体脂百分比和母亲教育程度。
较少的屏幕时间（低于组中位数 5.3 小时/天）和更频繁的剧烈身体活动（≥4 次/周）与报告较少的抑郁、焦虑、低自尊和生活不满症状相关。客观测量的身体活动与心理健康结果之间没有观察到显著关联。交互回归分析表明，报告较少的屏幕时间和更频繁的剧烈身体活动的组报告抑郁、焦虑、低自尊和生活不满症状的风险最低。
冰岛青少年报告较少的屏幕时间和更频繁的剧烈身体活动与报告心理健康问题的风险降低相关。那些报告了较少的屏幕时间和更频繁的剧烈身体活动的组合的人风险最低，这表明这两种行为对心理健康结果存在协同关系。我们的研究结果支持指导年轻人走向更积极和较少久坐/基于屏幕的生活方式。
