SummaryUrinary albumin excretion is a predictor of cardiovascular death. Cardiac rehabilitation (CR) with exercise training (ET) has been shown to improve exercise capacity and prognosis in patients with cardiovascular disease (CVD). However, it remains unclear whether CR reduces urinary albumin excretion in CVD patients. We performed a retrospective, observational study using data obtained from 98 male CVD patients without macroalbuminuria and estimated glomerular filtration rate (eGFR) < 30 mL/minute/1.73 m 2 who participated in CR with ET during hospitalization. Twenty-three patients continued supervised ET for 6 months (supervised group) and 75 patients quit supervised ET (non-supervised group). The supervised ET program consisted of 60 minutes of supervised sessions 1-3 times a week and 30-60 minutes of home exercise at least twice a week. Urinary albumin/creatinine ratio (ACR) was significantly decreased in the supervised group at 6 months after enrollment (43 ± 71 mg/g to 17 ± 20 mg/g creatinine, P < 0.05) but not in the non-supervised group. eGFR was unchanged in the supervised group but was significantly decreased in the non-supervised group (72 ± 18 mL/minute/1.73 m 2 to 67 ± 17 mL/minute/1.73 m 2 , P < 0.001). The results of multiple regression analysis showed that only supervised ET was an independent contributor to ΔACR. CR with supervised ET decreased urinary albumin excretion without deterioration of renal function. These findings suggest that continuation of a supervised ET program is associated with reduction in the development of CVD and reduction in cardiovascular morbidity and mortality in CVD patients. (Int Heart J 2015; 56: 105-109) Key words: Supervised exercise training U rinary albumin excretion has long been recognized as a risk factor for progression to end-stage renal failure in individuals in the general population as well as individuals with hypertension or diabetes mellitus. Recently, urinary albumin excretion has been shown to be associated with an increased incidence of all-cause and cardiovascular morbidity and mortality in general populations and in patients with hypertension or diabetes mellitus. [1][2][3] In addition, low levels of urinary albumin excretion well below the current microalbuminuria threshold have been shown to predict the development of CVD. 4,5) CR with ET has been shown to improve exercise capacity and prognosis in CVD patients.6) Medications such as angiotensin-converting enzyme inhibitors (ACEIs), angiotensin II receptor blockers (ARBs), and statins have also been reported to improve prognosis in CVD patients. In addition, these medications reduce urinary albumin excretion.7-9) However, it remains unclear whether CR ameliorates albuminuria in patients with CVD.The purpose of the present study was to clarify the effect of CR on urinary albumin excretion in patients with CVD.