| Juvenile sturgeon exhibit reduced physiological responses to exercise. | |
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MedLine Citation:
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PMID: 11815652 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Experiments were conducted to determine the physiological responses to exercise of Atlantic sturgeon (Acipenser oxyrhynchus) and shortnose sturgeon (A. brevirostrum). We measured the rates of oxygen consumption and ammonia excretion in both species and a variety of physiological parameters in both muscle (e.g. lactate, glycogen, pyruvate, glucose and phosphocreatine concentrations) and blood (e.g. osmolality and lactate concentration) in juvenile shortnose sturgeon following 5 min of exhaustive exercise. In both species, oxygen consumption and ammonia excretion rates increased approximately twofold following exhaustive exercise. Post-exercise oxygen consumption rates decreased to control levels within 30 min in both sturgeon species, but post-exercise ammonia excretion rates remained high in Atlantic sturgeon throughout the 4 h experiment. Resting muscle energy metabolite levels in shortnose sturgeon were similar to those of other fish species, but the levels decreased only slightly following the exercise period and recovery occurred within an hour. Under resting conditions, muscle lactate levels were low (<1 micromol g(-1)) but they increased to approximately 6 micromol g(-1) after exercise, returning to control levels within 6 h. Unlike similarly stressed teleost fish, such as the rainbow trout, plasma lactate levels did not increase substantially and returned to resting levels within 2 h. Plasma osmolality was not significantly affected by exercise in shortnose sturgeon. Taken together, these results suggest that shortnose and Atlantic sturgeon do not exhibit the physiological responses to exhaustive exercise typical of other fish species. They may possess behavioural or endocrinological mechanisms that differ from those of other fishes and that lead to a reduced ability to respond physiologically to exhaustive exercise. |
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Authors:
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J D Kieffer; A M Wakefield; M K Litvak |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of experimental biology Volume: 204 ISSN: 0022-0949 ISO Abbreviation: J. Exp. Biol. Publication Date: 2001 Dec |
Date Detail:
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Created Date: 2002-01-29 Completed Date: 2002-04-04 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: England |
Other Details:
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Languages: eng Pagination: 4281-9 Citation Subset: IM |
Affiliation:
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Department of Biology and Centre for Coastal Studies and Aquaculture, University of New Brunswick, PO Box 5050, Saint John, New Brunswick, Canada E2L 4L5. jkieffer@unbsj.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Ammonia
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metabolism Animals Blood Energy Metabolism Fishes / physiology* Glucose / metabolism Kinetics Lactic Acid / blood, metabolism Muscle, Skeletal / metabolism Osmolar Concentration Oxygen Consumption Phosphocreatine / metabolism Physical Exertion / physiology* Pyruvic Acid / metabolism |
| Chemical | |
Reg. No./Substance:
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127-17-3/Pyruvic Acid; 50-21-5/Lactic Acid; 50-99-7/Glucose; 67-07-2/Phosphocreatine; 7664-41-7/Ammonia |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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