| Effect of increasing work rate on metabolic responses of the donkey (Equus asinus). | |
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MedLine Citation:
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PMID: 7836149 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Oxygen consumption (VO2) and concentration of venous blood metabolites were measured in donkeys trained to run and to pull loads on a treadmill. VO2 in two donkeys running at maximal speed on a 9.8% slope was 110 +/- 2 ml.min-1.kg-1, approximately 22 times preexercise VO2. Average heart rate at maximal VO2 (VO2max) was 223 +/- 2 beats/min, five times the preexercise heart rate. Blood lactate increased 14-fold, and blood glucose did not change (P > 0.05). Animals running up a 4% incline and incremental draft loading of five donkeys walking on the level were also studied. The total energy cost of walking unloaded was 2.86 +/- 0.06 J.m-1.kg live wt-1. During low- to medium-intensity draft work for 25 min, glucose fell below preexercise values (P < 0.05), whereas plasma hematocrit and cortisol increased (P < 0.05). Blood lactate remained unchanged up to approximately 40% VO2 max but increased 170% at approximately 60% VO2max. The responses in donkeys are similar to those of exercising horses except for the rapid decline in blood glucose observed during low-intensity exercise and the lower lactate levels at both the high-intensity exercise and the apparent anaerobic threshold. |
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Authors:
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P J Mueller; M T Jones; R E Rawson; P J van Soest; H F Hintz |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 77 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 1994 Sep |
Date Detail:
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Created Date: 1995-02-28 Completed Date: 1995-02-28 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1431-8 Citation Subset: IM |
Affiliation:
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Department of Animal Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York 14853. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Glucose / metabolism Calorimetry Energy Metabolism / physiology* Female Heart Rate / physiology Hematocrit Hydrocortisone / blood Lactates / blood Lactic Acid Lactose / blood Locomotion / physiology Male Oxygen Consumption / physiology* Perissodactyla / metabolism* Physical Exertion / physiology* |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Lactates; 50-21-5/Lactic Acid; 50-23-7/Hydrocortisone; 63-42-3/Lactose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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