| Ice slurry ingestion increases core temperature capacity and running time in the heat. | |
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MedLine Citation:
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PMID: 19952832 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To investigate the effect of ice slurry ingestion on thermoregulatory responses and submaximal running time in the heat. METHODS: On two separate occasions, in a counterbalanced order, 10 males ingested 7.5 g·kg(-1) of either ice slurry (-1°C) or cold water (4°C) before running to exhaustion at their first ventilatory threshold in a hot environment (34.0°C ± 0.2°C, 54.9% ± 5.9% relative humidity). Rectal and skin temperatures, HR, sweating rate, and ratings of thermal sensation and perceived exertion were measured. RESULTS: Running time was longer (P = 0.001) after ice slurry (50.2 ± 8.5 min) versus cold water (40.7 ± 7.2 min) ingestion. Before running, rectal temperature dropped 0.66°C ± 0.14°C after ice slurry ingestion compared with 0.25°C ± 0.09°C (P = 0.001) with cold water and remained lower for the first 30 min of exercise. At exhaustion, however, rectal temperature was higher (P = 0.001) with ice slurry (39.36°C ± 0.41°C) versus cold water ingestion (39.05°C ± 0.37°C). During exercise, mean skin temperature was similar between conditions (P = 0.992), as was HR (P = 0.122) and sweat rate (P = 0.242). After ice slurry ingestion, subjects stored more heat during exercise (100.10 ± 25.00 vs 78.93 ± 20.52 W·m(-2), P = 0.005), and mean ratings of thermal sensation (P = 0.001) and perceived exertion (P = 0.022) were lower. CONCLUSIONS: Compared with cold water, ice slurry ingestion lowered preexercise rectal temperature, increased submaximal endurance running time in the heat (+19% ± 6%), and allowed rectal temperature to become higher at exhaustion. As such, ice slurry ingestion may be an effective and practical precooling maneuver for athletes competing in hot environments. |
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Authors:
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Rodney Siegel; Joseph Maté; Matt B Brearley; Greig Watson; Kazunori Nosaka; Paul B Laursen |
Publication Detail:
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Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 42 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-11-25 Completed Date: 2011-04-07 Revised Date: 2011-12-14 |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 717-25 Citation Subset: IM; S |
Affiliation:
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School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia. r.siegel@ecu.edu.au |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Body Temperature / physiology* Body Temperature Regulation Drinking* Hot Temperature* Humans Ice* Male Physical Endurance / physiology* Running / physiology* Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Ice |
| Comments/Corrections | |
Comment In:
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Clin J Sport Med. 2011 Nov;21(6):541-2
[PMID:
22064722
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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