CIRCULATORY ADJUSTMENTS TO MODERATE EXERCISE IN NORMAL INDIVIDUALS, WITH PARTICULAR REFERENCE TO THE INTERRELATION BETWEEN THE VELOCITY AND VOLUME OF THE BLOOD FLOW

Abstract

In 5 normal individuals estimations were made of the cardiac minute and stroke volume outputs, the respiratory exchange, the velocity of blood flow, the cardiac rate, the arterial and venous blood pressures and the vital capacity of the lungs both at rest and during the performance of a moderate exercise. The velocity of blood flow from the cubital vein through the pulmonary vessels to the carotid artery is increased during exercise to a less extent than the minute volume of the heart. During exercise the systolic arterial blood pressure is definitely increased but there is little or no increase in the diastolic pressure. The venous pressure is increased. The vital capacity of the lungs does not change significantly. The significance of these findings is discussed in relation to the changes in the hemodynamics during exercise.