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Abstract：
The World Health Organization (WHO) released in 2020 updated global guidelines on physical activity and sedentary behaviour for children, adolescents, adults, older adults and sub-populations such as pregnant and postpartum women and those living with chronic conditions or disabilities.
To summarize the evidence on the associations between physical activity, sedentary behaviour, and health-related outcomes used to inform the 2020 WHO guidelines on physical activity and sedentary behaviour for children and adolescents aged 5-17 years.
The update of the WHO guideline recommendations for children and adolescents utilized and systematically updated the evidence syntheses on physical activity and sedentary behaviour conducted for the 2016 Canadian 24-Hour Movement Guidelines for Children and Youth, the 2019 Australian 24-Hour Movement Guidelines for Children and Young People (5-17 years), and the 2018 Physical Activity Guidelines for Americans, Second Edition. Systematic reviews published from 2017 up to July 2019 that addressed the key questions were identified, and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) framework was used to rate the certainty of the evidence for the entire body of evidence.
The updated literature search yielded 21 relevant systematic reviews. The evidence base reviewed (i.e., existing and new systematic reviews) provided evidence that greater amounts and higher intensities of physical activity as well as different types of physical activity (i.e., aerobic and muscle and bone strengthening activities) are associated with improved health outcomes (primarily intermediate outcomes). There was sufficient evidence to support recommendations on limiting sedentary behaviours, which was not addressed in the 2010 WHO guidelines. However, there is still insufficient evidence available to fully describe the dose-response relationships between physical activity or sedentary behaviour and health outcomes, and whether the associations vary by type or domain of physical activity or sedentary behaviour.
Addressing the identified research gaps will better inform guideline recommendations in children and adolescents, and future work should aim to prioritize these areas of research. In the meantime, investment and leadership is needed to scale up known effective policies and programs aimed at increasing activity in children and adolescents.
To summarize the evidence on the associations between physical activity, sedentary behaviour, and health-related outcomes used to inform the 2020 WHO guidelines on physical activity and sedentary behaviour for children and adolescents aged 5-17 years.
The update of the WHO guideline recommendations for children and adolescents utilized and systematically updated the evidence syntheses on physical activity and sedentary behaviour conducted for the 2016 Canadian 24-Hour Movement Guidelines for Children and Youth, the 2019 Australian 24-Hour Movement Guidelines for Children and Young People (5-17 years), and the 2018 Physical Activity Guidelines for Americans, Second Edition. Systematic reviews published from 2017 up to July 2019 that addressed the key questions were identified, and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) framework was used to rate the certainty of the evidence for the entire body of evidence.
The updated literature search yielded 21 relevant systematic reviews. The evidence base reviewed (i.e., existing and new systematic reviews) provided evidence that greater amounts and higher intensities of physical activity as well as different types of physical activity (i.e., aerobic and muscle and bone strengthening activities) are associated with improved health outcomes (primarily intermediate outcomes). There was sufficient evidence to support recommendations on limiting sedentary behaviours, which was not addressed in the 2010 WHO guidelines. However, there is still insufficient evidence available to fully describe the dose-response relationships between physical activity or sedentary behaviour and health outcomes, and whether the associations vary by type or domain of physical activity or sedentary behaviour.
Addressing the identified research gaps will better inform guideline recommendations in children and adolescents, and future work should aim to prioritize these areas of research. In the meantime, investment and leadership is needed to scale up known effective policies and programs aimed at increasing activity in children and adolescents.
摘要：
世界卫生组织（WHO）于2020年发布了关于儿童身体活动和久坐行为的全球指南。青少年,成年人,老年人和亚人群，如孕妇和产后妇女以及患有慢性病或残疾的人。
总结体力活动之间的关联的证据，久坐的行为，和健康相关的结果，用于为2020年世卫组织关于5-17岁儿童和青少年身体活动和久坐行为的指南提供信息。
世卫组织儿童和青少年指南建议的更新利用并系统地更新了2016年加拿大儿童和青少年24小时运动指南中关于身体活动和久坐行为的证据综合。2019年澳大利亚儿童和青少年24小时运动指南（5-17岁），和2018年美国人体育锻炼指南，第二版。从2017年到2019年7月发布的解决关键问题的系统评价已经确定，和建议评估的分级，使用开发和评估（GRADE）框架来评估整个证据的确定性。
更新的文献检索产生了21个相关的系统综述。审查的证据基础(即，现有和新的系统评价)提供了证据，表明更大量和更高强度的身体活动以及不同类型的身体活动(即，有氧和肌肉和骨骼强化活动）与改善健康结果（主要是中间结果）有关。有足够的证据支持关于限制久坐行为的建议，2010年世卫组织指南中没有提到这一点。然而,仍然没有足够的证据来充分描述身体活动或久坐行为与健康结果之间的剂量反应关系，以及这些关联是否因身体活动或久坐行为的类型或领域而异。
解决已确定的研究差距将更好地为儿童和青少年提供指南建议。未来的工作应该旨在优先考虑这些研究领域。同时,需要投资和领导才能扩大已知的有效政策和计划，以增加儿童和青少年的活动。
总结体力活动之间的关联的证据，久坐的行为，和健康相关的结果，用于为2020年世卫组织关于5-17岁儿童和青少年身体活动和久坐行为的指南提供信息。
世卫组织儿童和青少年指南建议的更新利用并系统地更新了2016年加拿大儿童和青少年24小时运动指南中关于身体活动和久坐行为的证据综合。2019年澳大利亚儿童和青少年24小时运动指南（5-17岁），和2018年美国人体育锻炼指南，第二版。从2017年到2019年7月发布的解决关键问题的系统评价已经确定，和建议评估的分级，使用开发和评估（GRADE）框架来评估整个证据的确定性。
更新的文献检索产生了21个相关的系统综述。审查的证据基础(即，现有和新的系统评价)提供了证据，表明更大量和更高强度的身体活动以及不同类型的身体活动(即，有氧和肌肉和骨骼强化活动）与改善健康结果（主要是中间结果）有关。有足够的证据支持关于限制久坐行为的建议，2010年世卫组织指南中没有提到这一点。然而,仍然没有足够的证据来充分描述身体活动或久坐行为与健康结果之间的剂量反应关系，以及这些关联是否因身体活动或久坐行为的类型或领域而异。
解决已确定的研究差距将更好地为儿童和青少年提供指南建议。未来的工作应该旨在优先考虑这些研究领域。同时,需要投资和领导才能扩大已知的有效政策和计划，以增加儿童和青少年的活动。
