Background: Obesity has become the fifth leading cause of human death worldwide. It can cause numerous negative health effects, such as increased risk of diabetes, cardiovascular disease, hyperlipidemia, arteriosclerosis, and cancer. The World Health Organization(WHO) has defined overweight and obesity as a chronic disease. Physical activity to achieve the purpose of weight loss by consuming excess fat has always been considered one of the most important and effective ways for obesity prevention and weight control. According to our knowledge, there are so many clinical practice guidelines(CPGs) on physical activity for obesity, however, as so far, there are few studies systematically assessing the consistency of recommendations, methodological quality, and reporting quality about CPGs in physical activity for obesity.
Objectives: To systematically review the existing guidelines on physical activity for obesity and assess the consistency of their recommendations, methodological quality, and reporting quality.
Methods: We searched for CPGs in PubMed, EMBASE, Web of Science, CBM and four main guideline databases to identify existing physical activity for obesity guidelines. All searches were performed on 5 August 2019. The included research needs to meet the following criteria: (1) published guidelines on overweight, obesity or weight loss. (2) CPGs reported recommendations on physical activity for obesity. (3) The language of publication is English. We conducted pilot-literature selection to ensure high inter-rater reliability of reviewers firstly, and according to the established eligibility criteria, the titles and abstracts of the retrieval records are screened independently by two reviewers. Full-text has been looked up for records that meet the criteria for inclusion. Due to the mature research in this field and the number of guidelines, only the guidelines are included, not consensus, statements, and recommendations. Using the Appraisal of Guidelines for Research and Evaluation, 2nd edition (AGREE II) instrument to appraise methodological quality included in the guidelines, which includes 23 items in 6 domains. Then, we will use the Reporting Items for Practice Guidelines in Healthcare (RIGHT) tool to evaluate the quality of reports included in the guidelines, which consist of 22 items in 7 domains. We will also use Excel 2013 to sort out the scores in each domain of AGREE II, expressed as main scores and standard deviation(SD). Using SPSS 21.0 to calculate the Interclass Correlation Coefficient(ICC) and 95% Confidence Interval (95% CI) among reviewers. The ICC scores will be ranked into five groups: minor(0.01-0.20), fair(0.21-0.40), moderate(0.41-0.60), substantial(0.61-0.80), very good(0.81-1.00). Using SPSS version21.0 to conduct all the analyses. 
Results: This study is ongoing and results will be presented at Cochrane Colloquium as available.
Conclusions: This study is ongoing and results will be presented at Cochrane Colloquium as available.
Patient or healthcare consumer involvement: No applicable.