Objectives: To our knowledge, there is no clear consensus on a definitive cardiac rehabilitation method for patients undergoing Coronary Artery Bypass Graft (CABG). We conducted this systematic review to compare and evaluate the effects of two of the most frequent cardiac rehabilitation modalities, high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT), on cardiopulmonary variables.  

Methods: We carried out a systematic search of the databases PubMed, Web of Science, Embase, Scopus, and Google Scholar. Following the removal of duplicate results, the original search yielded 385 citations. We identified four randomized clinical trials after reviewing titles, abstracts, and potential full-text studies. We utilized the Cochrane Risk of Bias Tool (RoB2) to assess the risk of bias. 

 

Results: We included four randomized clinical trials involving 143 people. All trials included individuals who had CABG and completed HIIT or MICT sessions for at least four weeks. The findings indicated that HIIT programs may improve functional capacity, heart rate variability indices, and blood pressure management while lowering brain natriuretic peptide (BNP1-32 ) and N-terminal pro-b-type natriuretic peptide (NT-proBNP1-76 ) levels. 

 

Conclusion: Given the findings, it appeared that supervised high-intensity exercise regimens could be more useful to patients. Following the surgery, HIIT therapy improves exercise capacity, the autonomic nervous system, volume overload, and blood pressure regulation.