[Vector analysis of the repolarization phase in the exercise-ecg with Frank leads (author's transl)].

The bioelectrical activity of the heart during repolarization is analysed with Frank leads in a spatial vector model. After physical work most of the test persons showed an amplification of the repolarization vector. It is discussed whether the amplification of the T-vector after physical work should be interpreted as an indication of subendocardial ischemia.