| Sodium balance during U. S. football training in the heat: cramp-prone vs. reference players. | |
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MedLine Citation:
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PMID: 19777422 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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U. S. football players with a history of heat cramps were evaluated for the effect of physical training, sodium intake, and loss of sweat sodium on whole blood sodium concentration (BNa). Athletes (n=14 males, 24+/-1 y) were recruited and studied based on medical history, age, and position. The reference group (R, n=8 without a cramping history) and cramp-prone group (C, n=6, history of whole-body cramps associated with extensive sweat loss during exercise in the heat) were measured for body mass and BNa (ISTAT) before and after team training of 2.2 h in hot conditions (WBGT=29-32 degrees C). Intake and loss of fluid and sodium were also measured to determine respective acute balance. In R, BNa was stable pre- to post-training (138.9+/-1.8 to 139.0+/-2.0 mmol/L) while it tended to decline in C (137.8+/-2.3 to 135.7+/-4.9 mmol/L), and three subjects in C had BNa values below 135 mmol/L (131.7+/-2.9 mmol/L). C consumed a greater percentage of total fluid as water (p<0.05). Mean sweat sodium concentration was (52.6+/-29.2 mmol/L for C and 38.3+/-18.3 mmol/L for R (p>0.05). Compared to R, C tended to experience a decline in BNa and greater acute sodium imbalance. These changes may place cramp-prone players at greater risks for developing acute sodium deficits during training. |
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Authors:
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C A Horswill; J R Stofan; M Lacambra; T A Toriscelli; E R Eichner; R Murray |
Publication Detail:
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Type: Journal Article Date: 2009-09-23 |
Journal Detail:
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Title: International journal of sports medicine Volume: 30 ISSN: 1439-3964 ISO Abbreviation: Int J Sports Med Publication Date: 2009 Nov |
Date Detail:
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Created Date: 2009-10-30 Completed Date: 2010-01-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: Germany |
Other Details:
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Languages: eng Pagination: 789-94 Citation Subset: IM |
Copyright Information:
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(c) Georg Thieme Verlag KG Stuttgart . New York. |
Affiliation:
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Gatorade Sports Science Institute, Pepsico R & D, Barrington, IL, United States. craig.horswill@gatorade.com |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Case-Control Studies Dehydration Drinking Football / physiology* Heat Stress Disorders / etiology*, metabolism Humans Male Muscle Cramp / etiology*, metabolism Muscle, Skeletal / metabolism Sodium / metabolism* Sweat / chemistry Sweating / physiology United States Water-Electrolyte Balance / physiology Young Adult |
| Chemical | |
Reg. No./Substance:
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7440-23-5/Sodium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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