The National Exercise and Heart Disease Project: development, recruitment, and implementation.
D000041:Absenteeism; D000328:Adult; D004562:Electrocardiography; D006331:Heart Diseases / Q000534:rehabilitation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000523:psychology / Q000534:rehabilitation; D005082:Physical Exertion; D014481:United States; D014483:United States Dept. of Health and Human Services