Rechnitzer Lecture
Sixth Annual Peter A. Rechnitzer Lecture
WHY DO WE REQUIRE A SECOND HEART
DURING EXERCISE?
Loring B. Rowell, PhD
University of Washington School of Medicine
Seattle, Washington
Monday, May 15, 2000
4 p.m.
Room 270, Medical Science Building
Sponsors:
The Centre for Activity and Ageing
The Peter A. Rechnitzer Fund
School of Kinesiology
Department of Physiology
Faculty of Health Sciences
Faculty of Medicine and Dentistry
Faculty of Graduate Studies
Lawson Research Institute
Loring L. Rowell, Ph.D.
University of Washington School of Medicine
Dr. L.B. Rowell is Professor Emeritus of Physiology and Biophysics and Adjunct Professor of Medicine at the University of Washington School of Medicine in Seattle, Washington. He has made outstanding contributions to understanding the integrative aspects of cardiovascular control in humans. Responses to various system perturbations that include posture and dynamic exercise have occupied his interests. These two stresses provide the necessary models to examine the important features of cardiovascular control both neural and humoral at the whole body level. His book "Human Cardiovascular Control" is a landmark text that brings together these ideas and is suitable for teaching integrative cardiovascular physiology. The original articles that make up the fabric of this book have been assembled in a superb fashion and have made it the most authoritative and readable repository of information in this area of physiology. Dr. Rowell's ideas on these topics remain at the centre of thought in integrative cardiovascular controls.
WHY DO WE REQUIRE A SECOND HEART DURING EXERCISE?
ABSTRACT: Dr. Rowell's talk will address the problem
of maintaining central venous pressure in exercise.
Several so called "pumps" can displace blood
volume back to the heart: respiratory and abdominal
muscles, and muscles of the limbs. The limb muscles
are most important and the features that make them so
effective as pumps are presented. It is argued that
by contracting, these muscles can actually raise their
own blood flow; this can happen even without help from
the first heart the left ventricle. The need for a "second
heart" is not obvious until we try to raise cardiac
output without one. These attempts fail owing to physical
properties of the peripheral circulation. The final
message is that we need both a second heart and a neural
control of blood vessels in order to maintain ventricular
filling pressures during exercise. Top
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