Centro Nacional de Epidemiología. Instituto de Salud Carlos III (National Centre of Epidemiology, Carlos III Institute of Health), Madrid, Spain.
BMJ Open. 2013 May 14;3(5):e002644. doi: 10.1136/bmjopen-2013-002644.
Little is known about the dose-response relationship between physical activity and health benefits among young people. Our objective was to analyse the association between the frequency of undertaking moderate-to-vigorous physical activity (MVPA) and the self-reported health status of the adolescent population.
Cross-sectional study.
All regions of Spain.
Students aged 11-18 years participating in the Spanish Health Behaviour in School-aged Children survey 2006. A total of 375 schools and 21 188 students were selected.
The frequency of undertaking MVPA was measured by a questionnaire, with the following four health indicators: self-rated health, health complaints, satisfaction with life and health-related quality of life. Linear and logistic regression models were used to analyse the association, adjusting for potential confounding variables and the modelling of the dose-response relationship.
As the frequency of MVPA increased, the association with health benefits was stronger. A linear trend (p<0.05) was found for self-rated health and health complaints in males and females and for satisfaction with life among females; for health-related quality of life this relationship was quadratic for both sexes (p<0.05). For self-reported health and health complaints, the effect was found to be of greater magnitude in males than in females and, in all scales, the benefits were observed from the lowest frequencies of MVPA, especially in males.
A protective effect of MVPA was found in both sexes for the four health indicators studied, and this activity had a gradient effect. Among males, health benefits were detected from very low levels of physical activity and the magnitude of the relationship was greater than that for females.
人们对青少年体力活动与健康益处之间的剂量反应关系知之甚少。本研究旨在分析从事中等到剧烈体力活动（MVPA）的频率与青少年人群自报健康状况之间的关系。
横断面研究。
西班牙所有地区。
参加西班牙青少年健康行为调查 2006 年的 11-18 岁学生。共选取了 375 所学校和 21188 名学生。
MVPA 的频率通过问卷进行测量，采用以下四个健康指标：自感健康状况、健康抱怨、生活满意度和健康相关生活质量。采用线性和逻辑回归模型分析相关性，调整潜在混杂变量，并对剂量反应关系进行建模。
随着 MVPA 频率的增加，与健康益处的相关性增强。在男性和女性中，MVPA 频率与自感健康状况和健康抱怨呈线性趋势（p<0.05），女性的生活满意度也呈线性趋势；对于健康相关生活质量，这种关系在两性中均呈二次曲线（p<0.05）。对于自报健康状况和健康抱怨，男性的影响大于女性，而且在所有量表中，健康益处都可以从最低的 MVPA 频率中观察到，尤其是男性。
MVPA 对研究的四个健康指标均有保护作用，且这种活动具有梯度效应。在男性中，即使在非常低水平的体力活动下也能检测到健康益处，而且这种关系的强度大于女性。
