Functional Sympatholysis During Muscular Activity

Author:

Remensnyder John P.1,Mitchell Jere H.1,Sarnoff Stanley J.1

Affiliation:

1. Laboratory of Cardiovascular Physiology, National Heart Institute, Bethesda, Maryland

Abstract

The effects of both direct and reflexly induced increases in sympathetic activity on the blood flow to an extremity at rest and during muscular activity have been studied. When the O 2 uptake of an extremity is increased during muscular activity, its vascular resistance falls sharply with a small increase in O 2 uptake and thereafter declines only slightly. The responsiveness of a vascular bed to adrenergic stimulation diminishes sharply with a small increase in O 2 uptake and thereafter diminishes only slightly. The role of the carotid sinus as a sense organ which helps to regulate blood flow to the various tissues of the organism in accordance with their varying metabolic requirements rather than one which acts only as a receptor that helps to safeguard flow to the vital organs has been discussed.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Cardiology and Cardiovascular Medicine,Physiology

Reference32 articles.

1. Control of peripheral vascular beds during exercise;BEMENSNYDER J. P.;Fed. Proc.,1960

2. REMENSNYDER , J. P. , MITCHELL , J. H. , AND SARNOFF, 8. J . : Effect of carotid sinus activity or local oxygen consumption at rest and during exercise. Fed. Proc. 20 : 103 , 1961 .

3. An Improved Recording Rotameter

4. An improved arteriovenous oxygen difference recorder

5. Determination of gasses in blood and other solutions by vacuum extraction and manometric measurement;VAN SLYKE D. D.;J. Biol. Chem.,1924

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