Michael J. Joyner, M.D.

Professor, Department of Anesthesiology, Mayo Clinic and Foundation

 

 

Michael J. Joyner began working in exercise physiology as an undergraduate in the late 1970s with Professor Jack Wilmore at the University of Arizona .  He also received his M.D. degree in 1987 at Arizona and then pursued further clinical and research training at the Mayo Clinic. At Mayo he came under the influence of Professor John T. Shepherd.  One major focus of his work is the mechanisms and consequences of exercise hyperemia.  Dr. Joyner is currently Professor of Anesthesiology and Vice Chair of the department of Physiology and Bioengineering at Mayo.  He holds key editorial positions at the Journal of Applied Physiology and The Journal of Physiology (London).

 

 

Muscle Blood Flow and Exercise

 

Blood flow to exercising muscles can increase dramatically.  However, the mechanisms that cause this increase in flow remain poorly understood.  In this presentation ideas about how mechanical, neural and metabolic factors might interact to regulate blood flow to exercising muscles will be discussed. An overall historical perspective will also be presented so that new ideas can be considered in the context of older theories.  The potential impact of vasodilation in exercising muscles on arterial pressure regulation will also be emphasized and an attempt will be made to integrate a variety of old and new concepts on this important topic.