| Fluid and electrolyte supplementation after prolonged moderate-intensity exercise enhances muscle glycogen resynthesis in Standardbred horses. | |
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MedLine Citation:
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PMID: 18948447 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We hypothesized that postexercise rehydration using a hypotonic electrolyte solution will increase the rate of recovery of whole body hydration, and that this is associated with increased muscle glycogen and electrolyte recovery in horses. Gluteus medius biopsies and jugular venous blood were sampled from six exercise-conditioned Standardbreds on two separate occasions, at rest and for 24 h following a competitive exercise test (CET) designed to simulate the speed and endurance test of a 3-day event. After the CETs, horses were given water ad libitum, and either a hypotonic commercial electrolyte solution (electrolyte) via nasogastric tube, followed by a typical hay/grain meal, or a hay/grain meal alone (control). The CET resulted in decreased total body water and muscle glycogen concentration of 8.4 +/- 0.3 liters and 22.6%, respectively, in the control treatment, and 8.2 +/- 0.4 liters and 21.9% in the electrolyte treatment. Electrolyte resulted in an enhanced rate of muscle glycogen resynthesis and faster restoration of hydration (as evidenced by faster recovery of plasma protein concentration, maintenance of plasma osmolality, and greater muscle intracellular fluid volume) during the recovery period compared with control. There were no differences in muscle Na, K, Cl, or Mg contents between the two treatments. It is concluded that oral administration of a hypotonic electrolyte solution after prolonged moderate-intensity exercise enhanced the rate of muscle glycogen resynthesis during the recovery period compared with control. It is speculated that postexercise dehydration may be one key contributor to the slow muscle glycogen replenishment in horses. |
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Authors:
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Amanda P Waller; George J F Heigenhauser; Raymond J Geor; Lawrence L Spriet; Michael I Lindinger |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-10-23 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 106 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2009 Jan |
Date Detail:
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Created Date: 2009-01-09 Completed Date: 2009-02-19 Revised Date: - |
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: 91-100 Citation Subset: IM |
Affiliation:
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Dept. of Human Health and Nutritional Sciences, Univ. of Guelph, Guelph, ON, Canada N1G 2W1. awaller@uoguelph.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Administration, Oral Animal Feed Animal Nutritional Physiological Phenomena Animals Blood Glucose / metabolism Blood Proteins / metabolism Body Water / metabolism Chlorides / blood Fluid Therapy / veterinary* Glycogen / metabolism* Horses Hypotonic Solutions / administration & dosage* Magnesium / blood Male Muscle Contraction* Muscle, Skeletal / metabolism* Osmolar Concentration Physical Conditioning, Animal* Potassium / blood Sodium / blood Time Factors Water-Electrolyte Balance* |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Blood Proteins; 0/Chlorides; 0/Hypotonic Solutions; 7439-95-4/Magnesium; 7440-09-7/Potassium; 7440-23-5/Sodium; 9005-79-2/Glycogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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