Variations in Electrocardiographic Responses during Exercise
Studies of Normal Subjects under Unusual Stresses and of Patients with Cardiopulmonary Diseases
Precordial electrocardiograms were taken before, during, and after exercise in 20 normal subjects and in 48 patients with cardiopulmonary diseases. Analysis of the findings was based on changes in Q-T interval, alterations in QRS, RS-T and T waves and on presence or absence of premature beats. Whereas in performing standard tests, normal subjects showed no evidence of coronary insufficiency, in about two-thirds of the patients abnormal changes were demonstrable. Definite RS-T depression and changes in Q-T interval were also observed in normal subjects under unusual stresses. The electrocardiographic changes during exertion were discussed and emphasized.
- © 1951 American Heart Association, Inc.