School of Epidemiology and Public Health, University of Ottawa, Ottawa, Ontario, Canada.
Health Analysis Division, Statistics Canada, Ottawa, Ontario, Canada.
BMJ Open. 2018 Oct 17;8(10):e021119. doi: 10.1136/bmjopen-2017-021119.
Physical and sedentary activities have been identified as potentially modifiable risk factors for many diseases, including mental illness, and may be effective targets for public health policy and intervention. However, the relative contribution of physical activity versus sedentary behaviour to mental health is less clear. This study investigated the cross-sectional association between physical activity, sedentary activity and symptoms of depression and anxiety at age 14-15 in the National Longitudinal Survey of Children and Youth (NLSCY).
Respondents aged 14-15 years between 1996 and 2009 who reported on symptoms of depression in the NLSCY were included (n=9702). Multinomial logistic regression was used to assess the relationship between physical and sedentary activity and symptoms of depression and anxiety. Joint models including both physical and sedentary activity were also explored. Models were adjusted for sex, ethnicity, immigration status, family income, parental education, recent major stressful life events and chronic health conditions.
The odds of having moderate and severe symptoms of depression and anxiety compared with no symptoms was 1.43 (1.11 to 1.84) and 1.88 (1.45 to 2.45) times higher, respectively, in physically inactive youth relative to physically active youth. The odds of having moderate and severe symptoms of depression and anxiety compared with no symptoms was 1.38 (1.13 to 1.69) and 1.31 (1.02 to 1.69) times higher, respectively, in sedentary youth relative to non-sedentary youth. In joint models including both physical and sedentary activity, sedentary activity was not consistently associated with symptoms of depression and anxiety.
Both physical inactivity and sedentary activity appear to be significantly related to symptoms of depression and anxiety. The importance of distinguishing these two behaviours has relevance for research as well as policies targeting physical activity and mental health in youth.
身体活动和久坐行为已被确定为许多疾病（包括精神疾病）的潜在可改变风险因素，它们可能是公共卫生政策和干预的有效目标。然而，身体活动与久坐行为对心理健康的相对贡献尚不明确。本研究调查了全国儿童纵向调查（NLSCY）中 14-15 岁青少年的身体活动、久坐行为与抑郁和焦虑症状之间的横断面关联。
纳入了 1996 年至 2009 年间 NLSCY 报告有抑郁症状的 14-15 岁的受访者（n=9702）。采用多项逻辑回归来评估身体活动和久坐行为与抑郁和焦虑症状之间的关系。还探讨了同时包含身体活动和久坐行为的联合模型。模型调整了性别、族裔、移民身份、家庭收入、父母教育程度、近期重大生活压力事件和慢性健康状况等因素。
与身体活跃的青少年相比，身体不活跃的青少年出现中度和重度抑郁和焦虑症状的几率分别高出 1.43 倍（1.11 至 1.84）和 1.88 倍（1.45 至 2.45）。与非久坐的青少年相比，久坐的青少年出现中度和重度抑郁和焦虑症状的几率分别高出 1.38 倍（1.13 至 1.69）和 1.31 倍（1.02 至 1.69）。在同时包含身体活动和久坐行为的联合模型中，久坐行为与抑郁和焦虑症状之间的关联并不一致。
身体不活动和久坐行为似乎都与抑郁和焦虑症状显著相关。区分这两种行为对于研究以及针对青少年身体活动和心理健康的政策都具有重要意义。
