Department of Physical Activity Sciences, Université du Québec à Montréal, Montréal, Québec, Canada.
Research Center, University Institute of Mental Health at Montreal, Montréal, Québec, Canada.
PLoS One. 2018 Oct 24;13(10):e0204682. doi: 10.1371/journal.pone.0204682. eCollection 2018.
Although higher physical activity (PA) levels are associated with better mental health, previous findings about the shape of the dose-response relationship between PA and mental health are inconsistent. Furthermore, this association may differ according to sedentary levels. We investigated the cross-sectional dose-response associations between objectively measured PA and mental health in a representative national sample of adults. We also examined whether sedentary time modified the PA-mental health associations. Based on 2007-2013 Canadian Health Measures Survey data, PA and sedentary time were measured using accelerometry among 8150 participants, aged 20 to 79 years. Generalized additive models with a smooth function were fitted to examine associations between minutes per day of moderate and vigorous PA (MVPA), light PA (LPA), daily steps (combined or not with sedentary time) and self-rated mental health. A significant curvilinear relationship between average daily minutes of MVPA and mental health was observed, with increasing benefits up to 50 minutes/day. For LPA, a more complex shape (monotonic and curvilinear) was found. For daily steps, inverted U-shaped curve suggested increasing benefits until a plateau between 5 000 and 16 000 steps. The MVPA-LPA combination was significantly associated with mental health but with a complex pattern (p < 0.0005E-06). The tested PA-sedentary time combinations showed that increasing sedentary time decreased the positive PA-mental health associations. Non-linear dose-response patterns between the PA modalities and self-reported mental health were observed. Optimal doses of daily minutes of MVPA, LPA, MVPA combined with LPA and daily steps are independently associated with better mental health in adults. The results also suggest that PA-mental health associations could be hampered by daily sedentary time.
虽然较高的身体活动（PA）水平与更好的心理健康有关，但之前关于 PA 与心理健康之间剂量反应关系的形状的发现并不一致。此外，这种关联可能因久坐水平而异。我们调查了在具有代表性的全国性成年人样本中，客观测量的 PA 与心理健康之间的横断面剂量反应关系。我们还研究了久坐时间是否改变了 PA 与心理健康的关联。基于 2007-2013 年加拿大健康测量调查数据，在年龄在 20 至 79 岁的 8150 名参与者中，使用加速度计测量了 PA 和久坐时间。使用平滑函数的广义加性模型来检查每天中等到剧烈 PA（MVPA）、轻度 PA（LPA）、日常步数（与久坐时间结合或不结合）与自我评估心理健康之间的关联。观察到平均每天 MVPA 分钟数与心理健康之间存在显著的曲线关系，随着每天 50 分钟的增加，益处不断增加。对于 LPA，发现了更复杂的形状（单调和曲线）。对于日常步数，倒 U 形曲线表明，在 5000 到 16000 步之间达到平台之前，益处不断增加。MVPA-LPA 组合与心理健康显著相关，但模式复杂（p<0.0005E-06）。测试的 PA-久坐时间组合表明，久坐时间的增加会降低 PA 与心理健康的正相关。观察到 PA 模式与自我报告的心理健康之间存在非线性剂量反应关系。每天 MVPA、LPA、MVPA 与 LPA 相结合和日常步数的最佳剂量与成年人的更好心理健康独立相关。结果还表明，PA 与心理健康的关联可能因日常久坐时间而受到阻碍。
