Why the study?
Does exercise testing reveal different electrocardiographic responses in normal subjects compared to patients with cardiopulmonary diseases?
Does exercise testing reveal different electrocardiographic responses in normal subjects compared to patients with cardiopulmonary diseases?
Exercise testing reveals abnormal electrocardiographic changes in a majority of patients with cardiopulmonary disease, and extreme stress can induce changes even in normal subjects.
Supports exercise ECG differentiation in cardiopulmonary disease; leaves open validation of stress thresholds in prospective modern cohorts.
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.
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Yu et al. (1951) studied this question.
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