Catecholamine release and blood pressure changes induced by exercise in dogfish

Plasma norepinephrine (NE), epinephrine (E), and potassium (K+) were measured before, during a 3-min bout of exercise, and at intervals after exercise in Squalus acanthias. The dorsal aortic pressure response following 1 min of exercise was observed in another series of experiments. Plasma E, NE, an...

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Bibliographic Details
Published inThe American journal of physiology Vol. 242; no. 3; pp. R306 - R310
Main Authors Opdyke, D.F, Carroll, R.G, Keller, N.E
Format Journal Article
LanguageEnglish
Published United States 01.03.1982
Subjects
Animals
Blood Pressure
Dogfish - physiology
Epinephrine - blood
Female
Norepinephrine - blood
Physical Exertion
Potassium - blood
Sharks - physiology
Squalus acanthias
Time Factors
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Summary:Plasma norepinephrine (NE), epinephrine (E), and potassium (K+) were measured before, during a 3-min bout of exercise, and at intervals after exercise in Squalus acanthias. The dorsal aortic pressure response following 1 min of exercise was observed in another series of experiments. Plasma E, NE, and K+ increased significantly and progressively during the exercise period and for 2 min after exercise. Plasma E increased significantly during the 1st min; NE during the 2nd min; but K+ did not increase significantly until the 3rd min of exercise. Blood pressure decreased significantly during 1 min of exercise but increased over control level within 4 min after the end of exercise coincident with the peak of plasma E and NE concentrations. Plasma NE, E, and blood pressure decreased slowly in parallel fashion during the 37-min postexercise period of observation. Increased plasma K+ from skeletal muscle is probably not the primary stimulus for early catecholamine release in exercising dogfish, but increased plasma K+ does contribute to releasing and maintaining plasma NE and E levels in the postexercise period. This results in a sustained pressor effect that promotes blood flow and aids in metabolic recovery.
ISSN:0002-9513
2163-5773
DOI:10.1152/ajpregu.1982.242.3.R306