title: Cardiac arrhythmias and submaximal exercise test.
abstract: Cardiac arrhythmias, investigated in 1000 persons subjects to a submaximal exercise test, showed an incidence of 6%. The most frequent were the ventricular premature beats, related in more than half of the cases to an organic, probably ischemic, heart disease. Left bundle branch block and ventricular tachycardia were rare and indicated an organic heart disease. Several other rare arrhythmias are discussed. In patients with exercise-induced cardiac arrhythmias, an increased ratio of the tension-time index to maximal oxygen consumption indicates an uneconomical and less efficient cardiac work. The increase of the PEP and of the PEP/LEVT ratio during recovery, in the subjects exhibiting exercise-induced ventricular premature beats, also suggests a lowered cardiac efficiency. These findings support the view that cardiac arrhythmias frequently coexist with an organic, especially ischemic, heart disease.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D005080:Exercise Test; D006801:Humans