Abstract
The exercise electrocardiograms of 295 subjects, 180 males and 115 females, were stud d employing radiocardiography.
The heart rate and electrocardiographic changes during exercise were observed, and com ared with the post exercise electrocardiogram. A lead (CM5) was monitored continuous and recorded in the control supine and standing position, and in the supine position im ediately after the exercise. The ages ranged from 20 to 74 years (the average was 46.7 11.5 years of age). The subjects were divided into seven groups as follows: 16 patients ith angina pectoris, 46 patients with non-treated and 13 with well controled essential ypertension showing normal electrocardiograms, 17 patients with non-treated essential ypertension accompanied by left ventricular hypertrophy, 37 patients with well controled ssential hypertension and left ventricular hypertrophy, 76 normotensive patients with T-T changes and normal QRS waves and 90 healthy subjects. As a rule, they were sub cted to the Master's test (“augmented” two-step test).
The maximum heart rate during the exercise test differed among the seven groups.
One hundred sixteen out of 295 subjects (39.3%) showed abnormal electrocardiographic esponse to exercise (positive response) after the augmented two-step test according to the riteria used in this investigation. A higher prevalence of electrically abnormal response as observed in cases in whom the maximum heart rate during exercise reached above the 0% obtained from Robinson's nomogram. Increase in P terminal force in V1 lead was bserved more frequently in the positive response cases than in the negative.
An increase in R wave amplitude (CM5 lead) during the exercise test was observed freuently in patients with angina pectoris.
It was seen in the other groups less frequently.
