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J Appl Physiol 14: 809-812, 1959;
8750-7587/59 $5.00
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Aortic blood flow in dogs during treadmill exercise

Dean L. Franklin 1, Richard M. Ellis 1, and R. F. Rushmer 1

1 Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, Washington

Instantaneous blood flow through the thoracic aorta was monitored continuously during spontaneous activity in intact dogs by means of a new, pulsed, ultrasonic flowmeter. Integrated flow per stroke, accumulated flow per unit time and heart rate were simultaneously derived by means of electronic computers. During treadmill exercise at 3 mph on a 5% grade, the heart rate increased by two- or threefold, but the aortic flow per stroke was only slightly increased. This observation was confirmed by direct measurements, of left ventricular diameter. An increase in stroke volume is not an essential feature of the cardiac response to exercise in these experiments.

Submitted on December 15, 1958




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