Benefits of physical exercises in chronic kidney disease: a systematic review and meta-analysis of randomized controlled trials

Physical exercise has been proven to be beneficial for chronic kidney disease (CKD) patients; however, there is a lack of a comprehensive summary of existing literature, especially the results from randomized controlled trials (RCTs). We had conducted a systematic review and meta-analysis to evaluate the benefits of physical exercise in chronic kidney disease. Outcomes were classified into all-cause mortality, cardiovascular, pulmonary, and renal outcomes, inflammatory indices, laboratory tests, and physical indices. The risk of bias was assessed using the Cochrane criteria. Relative risk ratios with 95% confidence intervals (CIs) for categorical variables, and weighted mean difference or standardized mean differences with 95% CIs for continuous variables were pooled using a random-effects model. Publication bias was assessed using Funnel plot analysis and Egger's Test. At last, 82 studies were included, and the results of the meta-analysis show that the physical exercises can significantly reduce all-cause mortality, particularly in dialysis dependent patients. Cardiovascular function, reflected by 6-minute walk test and blood pressure and pulmonary function, reflected by peak oxygen uptake, forced expiratory volume in 1 second, and forced vital capacity, all improved after physical exercise interventions. Physical exercises helped to increase the dialysis adequacy and preserve the residual renal function. C-reactive protein and interleukin-6 levels decreased, and hemoglobin and albumin levels increased upon physical exercise interventions. The fat mass decreased after physical exercise interventions in non-dialysis patients. We concluded that physical exercise is beneficial for CKD patients, independent of the modes or locations of exercise.