OBSERVATIONS ON THE CHANGE OF VENTRICULAR SYSTOLE (QT INTERVAL) DURING EXERCISE 1

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Abstract
The change of QT interval during and after exercise was studied on 25 normal subjects, 20 patients with hypertensive and arteriosclerotic heart disease, 8 patients with congenital heart disease, and 24 patients with pulmonary disease. The chest lead of the ecg. was recorded minute by minute at rest, during exercise and recovery. The pattern of the change of the corrected QT interval or K in each of the 4 groups is as follows: In normal subjects,patients with pulmonary disease, and in patients with hypertensive and arteriosclerotic disease, there was a prolongation of K throughout the period of exercise, and the K shortened during the first 3 min. of recovery, except for no shortening of K during early recovery in the hypertensive and arteriosclerotic group. In patients with congenital heart disease the K shortened during exercise and lengthened during the early recovery. In all 4 groups the K had returned to resting value by the 8th minute of recovery. Exercise responses of QT/TQ ratio were presented and the significance in hypertensive and arteriosclerotic heart disease was discussed. The change of K was abnormal in 8 patients with hypertensive and arteriosclerotic heart disease who showed RS-T and T wave changes during or immediately after exercise.

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