Purpose: This study was designed to assess the long-term effects of low-fat diet and intensive physical exercise.
Methods: Long-term efficacy of exercise and diet was assessed in 18 nonselected, fully employed patients with symptomatic coronary artery disease. Results were compared to 18 patients on usual care.
Results: In the intervention group at 1 year, serum lipoproteins were brought to ideal levels, exercise-induced myocardial ischemia was significantly reduced, and progression in coronary atherosclerosis was retarded. After more than 5 years, patients in the intervention group showed a significant reduction in lipoprotein levels (total cholesterol, 248 [179-299] vs 214 [173-272] mg/dL, P < .01; low density lipoprotein, 146 [83-216], vs 152 [121-197] mg/dL, P < .005 vs control; triglycerides; 151 [80-303] mg/dl, vs 98 [46-182] mg/dL; P < .005) and body mass index (26 +/- 2.9 vs 25.4 +/- 3.3 kg/m2; P < .05). Exercise induced myocardial ischemia, measured by 201thallium scintigraphy, decreased by 29% (41 degrees +/- 36 degrees vs 29 degrees +/- 29 degrees, P = NS) and coronary atherosclerosis, assessed by angiography and digital image processing, progressed at a slower pace in light of a 21% increase in physical work capacity (169 +/- 40 vs 205 +/- 50, P < .01) and a 28% increase in maximal rate pressure product (25 +/- 6 vs 32 +/- 4, P < .004). In contrast, patients in the control group showed only poorly controlled coronary risk factors (total cholesterol, 243 [179-306] vs 26 [178-304] mg/dL, P = NS; low density lipoprotein, 151 [79-229] vs 196 [107-238] mg/dL, P < .0005 vs intervention; body mass index 25.7 +/- 2.5 vs 27.5 +/- 3.5 kg/m2, P < .01), whereas their physical work capacity tended to deteriorate (165 +/- 45 vs 142 +/- 62 Watts, P = not significant).
Conclusions: These data demonstrate that current usual care is insufficient in controlling risk factors of coronary artery disease. However, intensive physical exercise and low-fat diet remain an effective form of treatment after more than 5 years.