Document Detail


Changes in plasma and erythrocyte K+ during hypercapnia and different grades of exercise in trout.
MedLine Citation:
PMID:  1592716     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Trout were exposed to hypercapnia, two levels of aerobic exercise, or three successive periods of supramaximal exercise to evaluate the effects on erythrocyte and plasma K+. During aerobic exercise, plasma K+ increased slightly with the intensity of work, while no change was found in the erythrocyte K+ content. In contrast, both hypercapnia and supramaximal exercise induced a net erythrocyte K+ uptake. This uptake changed to a net loss of K+ as arterial pH and hemoglobin-bound oxygen saturation returned to control values during recovery. The maximal rates of net K+ uptake found during hypercapnia and supramaximal exercise corresponded to 195 and 350 mumol.kg fish-1.h-1, respectively, and the maximal rates of net K+ loss found during recovery corresponded in both cases to approximately 130 mumol.kg fish-1.h-1. Hypercapnia had only a minor effect on plasma K+, but return to normocapnic conditions induced a 0.8 mM rise in plasma K+. Of this increase, approximately 70% could be accounted for by the simultaneous net release of erythrocyte K+. Each period of supramaximal exercise induced an elevated plasma K+ level, resulting in accumulation of plasma K+ despite slight decreases in plasma K+ in between the exercise periods. At the same time the net erythrocyte K+ uptake caused an estimated reduction in plasma K+ of 1.5 mM. It is concluded that both hypercapnia and supramaximal exercise cause profound net changes in the erythrocyte K+ content with significant effects on plasma K+.
Authors:
O B Nielsen; G Lykkeboe
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  72     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1992 Apr 
Date Detail:
Created Date:  1992-06-29     Completed Date:  1992-06-29     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1285-90     Citation Subset:  IM    
Affiliation:
Department of Zoophysiology, University of Aarhus, Denmark.
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MeSH Terms
Descriptor/Qualifier:
Animals
Biological Transport, Active
Erythrocytes / metabolism
Hypercapnia / blood
Kinetics
Physical Endurance / physiology
Physical Exertion / physiology
Plasma / metabolism
Potassium / blood*
Trout / blood*
Chemical
Reg. No./Substance:
7440-09-7/Potassium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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