Document Detail


Sustained swimming at low velocity following a bout of exhaustive exercise enhances metabolic recovery in rainbow trout.
MedLine Citation:
PMID:  10667975     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sustained swimming at 0.9 BL s(-)(1), where BL is fork body length, following a bout of exhaustive exercise enhanced recovery of metabolite and acid-base status in rainbow trout compared with fish held in still water. The most striking effect of an active recovery was a total absence of the elevation cortisol concentration typically associated with exhaustive exercise. In fish swimming at 0. 9 BL s(-)(1), plasma cortisol levels averaged 20-25 ng ml(-)(1) throughout the 6 h recovery period. In contrast, plasma cortisol increased to a peak level of 128.4+/-11.2 ng ml(-)(1) (mean +/- s.e. m., N=6) in fish recovering in still water. Muscle glycogen was completely resynthesized and lactate cleared within 2 h of exercise in swimming fish compared with more than 6 h required in the fish held in still water. Similarly, blood lactate level and acid-base status were restored more quickly in the swimming fish. These observations suggest that the prolonged recovery usually associated with exhaustive exercise in rainbow trout is due to elevations in plasma cortisol concentration and that the stimulus for cortisol release is not exercise per se, but rather post-exercise inactivity.
Authors:
C L Milligan; G B Hooke; C Johnson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  203     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-05-05     Completed Date:  2000-05-05     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  921-6     Citation Subset:  IM    
Affiliation:
Department of Zoology, University of Western Ontario, London, Ontario, Canada N6A 5B7. milligan@julian.uwo.ca
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MeSH Terms
Descriptor/Qualifier:
Acid-Base Equilibrium
Animals
Hydrocortisone / blood
Kinetics
Lactic Acid / blood
Oncorhynchus mykiss / metabolism*
Physical Exertion / physiology*
Swimming / physiology*
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid; 50-23-7/Hydrocortisone

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


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