OBJECTIVE: To compare models of the postoperative hospital treatment phase after myocardial revascularization. DESIGN: A pilot randomized controlled trial. SETTING: Hospital patients in a hospital setting. SUBJECTS: Thirty-two patients with indications for myocardial revascularization were included between January 2008 and December 2009, with a left ventricular ejection fraction (LVEF) >= 50%, 1-second forced expiratory volume (FEV1) >= 60 and forced vital capacity (FVC) >= 60% of predicted value. INTERVENTIONS: Patients were randomly placed into two groups: one performed prescribed exercises according to the model proposed by the American College of Sports Medicine (ACSM) and the other according to a periodized model. MAIN MEASURES: Partial pressure of O2 (PO2) and arterial O2 saturation (SaO2), percentage of predicted FVC and total distance on the six-minute walking test (6MWT). RESULTS: Twenty-seven patients were re-evaluated upon release from the hospital (ACSM = 14 and PP = 13). Five patients extubated for more than 6 hours in the postoperative period were excluded from the sample. In the preoperative period the variables PO2, SaO2, %FVC and 6MWT were similar. In the postoperative period, a reduction was observed for all parameters in both groups. Upon comparison of the groups, a difference was observed in PO2 (ACSM = 68.0 +/- 4.3 versus PP = 75.9 +/- 4.8 mmHg; p < 0.001), SaO2 (ACSM = 93.5 +/- 1.4 versus PP = 94.8 +/- 1.2%; p = 0.018) and 6MWT (ACSM = 339.3 +/- 41.7 versus PP = 393.8 +/- 25.7 m; p < 0.001). There was no difference in %FVC. CONCLUSION: Patients after myocardial revascularization following a periodized model of exercise presented a better intra-hospital evolution when compared to those using the ACSM model.

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