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J Appl Physiol 83: 1575-1580, 1997;
8750-7587/97 $5.00
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Vol. 83, Issue 5, 1575-1580, 1997

Sympathetic vasoconstriction in active skeletal muscles during dynamic exercise

John B. Buckwalter, Patrick J. Mueller, and Philip S. Clifford

Departments of Anesthesiology and Physiology, Veterans Affairs Medical Center and Medical College of Wisconsin, Milwaukee, Wisconsin 53295

Received 26 December 1996; accepted in final form 11 July 1997.

Buckwalter, John B., Patrick J. Mueller, and Philip S. Clifford. Sympathetic vasoconstriction in active skeletal muscles during dynamic exercise. J. Appl. Physiol. 83(5): 1575-1580, 1997.---Studies utilizing systemic administration of alpha -adrenergic antagonists have failed to demonstrate sympathetic vasoconstriction in working muscles during dynamic exercise. The purpose of this study was to examine the existence of active sympathetic vasoconstriction in working skeletal muscles by using selective intra-arterial blockade. Six mongrel dogs were instrumented chronically with flow probes on the external iliac arteries of both hindlimbs and with a catheter in one femoral artery. All dogs ran on a motorized treadmill at three intensities on separate days. After 2 min, the selective alpha 1-adrenergic antagonist prazosin (0.1 mg) was infused as a bolus into the femoral artery catheter. At mild, moderate, and heavy workloads, there were immediate increases in iliac conductance of 76 ± 7, 54 ± 11, and 22 ± 6% (mean ± SE), respectively. Systemic blood pressure and blood flow in the contralateral iliac artery were unaffected. These results demonstrate that there is sympathetic vasoconstriction in active skeletal muscles even at high exercise intensities.

blood flow; alpha -adrenergic receptor; autonomic nervous system; prazosin; dogs

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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