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ABSTRACT Introduction: This study aimed to evaluate the efficacy of respiratory muscle training during the immediate postoperative period of cardiac surgery on respiratory muscle strength, pulmonary function, functional capacity, and length of hospital stay. Methods: This is a systematic review and meta-analysis. A comprehensive search on PubMed®, Excerpta Medica Database (or Embase), Cumulative Index of Nursing and Allied Health Literature (or CINAHL), Latin American and Caribbean Health Sciences Literature (or LILACS), Scientific Electronic Library Online (or SciELO), Physiotherapy Evidence Database (or PEDro), and Cochrane Central Register of Controlled Trials databases was performed. A combination of free-text words and indexed terms referring to cardiac surgery, coronary artery bypass grafting, respiratory muscle training, and clinical trials was used. A total of 792 studies were identified; after careful selection, six studies were evaluated. Results: The studies found significant improvement after inspiratory muscle training (IMT) (n = 165, 95% confidence interval [CI] 9.68, 21.99) and expiratory muscle training (EMT) (n = 135, 95% CI 8.59, 27.07) of maximal inspiratory pressure and maximal expiratory pressure, respectively. Also, IMT increased significantly (95% CI 19.59, 349.82, n = 85) the tidal volume. However, no differences were found in the peak expiratory flow, functional capacity, and length of hospital stay after EMT and IMT. Conclusion: IMT and EMT demonstrated efficacy in improving respiratory muscle strength during the immediate postoperative period of cardiac surgery. There was no evidence indicating the efficacy of IMT for pulmonary function and length of hospital stay and the efficacy of EMT for functional capacity. Introduction capacity Methods metaanalysis. metaanalysis meta analysis. analysis meta-analysis PubMed PubMed® or Embase, Embase , Embase) CINAHL, CINAHL CINAHL) LILACS, LILACS LILACS) SciELO, SciELO SciELO) PEDro, PEDro PEDro) performed freetext free text grafting used 79 identified selection evaluated Results (IMT 165 95 [CI 968 9 68 9.68 21.99 2199 21 99 (EMT 135 859 8 59 8.59 27.07 2707 27 07 respectively Also (95 1959 19 19.59 34982 349 82 349.82 85 volume However flow Conclusion 7 16 96 6 9.6 21.9 219 2 13 5 8.5 27.0 270 0 (9 195 1 19.5 3498 34 349.8 9. 21. 8. 27. ( 19. 3 349.