Document Detail


Cold drink ingestion improves exercise endurance capacity in the heat.
MedLine Citation:
PMID:  18685527     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: To investigate the effect of drink temperature on cycling capacity in the heat. METHODS: On two separate trials, eight males cycled at 66 +/- 2% VO2peak (mean +/- SD) to exhaustion in hot (35.0 +/- 0.2 degrees C) and humid (60 +/- 1%) environments. Participants ingested three 300-mL aliquots of either a cold (4 degrees C) or a warm (37 degrees C) drink during 30 min of seated rest before exercise and 100 mL of the same drink every 10 min during exercise. Rectal and skin temperatures, heart rate, and sweat rate were recorded. Ratings of thermal sensation and perceived exertion were assessed. RESULTS: Exercise time was longer (P < 0.001) with the cold drink (63.8 +/- 4.3 min) than with the warm drink (52.0 +/- 4.1 min). Rectal temperature fell by 0.5 +/- 0.1 degrees C (P < 0.001) at the end of the resting period after ingestion of the cold drinks. There was no effect of drink temperature on mean skin temperature at rest (P = 0.870), but mean skin temperature was lower from 20 min during exercise with ingestion of the cold drink than with the warm drink (P < 0.05). Heart rate was lower before exercise and for the first 35 min of exercise with ingestion of the cold drink than with the warm drink (P < 0.05). Drink temperature influenced sweat rate (1.22 +/- 0.34 and 1.40 +/- 0.41 L x h(-1) for the cold and the warm drink, respectively; P < 0.05). Ratings of thermal sensation and perceived exertion (P < 0.01) during exercise were lower when the cold drink was ingested. CONCLUSION: Compared with a drink at 37 degrees C, the ingestion of a cold drink before and during exercise in the heat reduced physiological strain (reduced heat accumulation) during exercise, leading to an improved endurance capacity (23 +/- 6%).
Authors:
Jason K W Lee; Susan M Shirreffs; Ronald J Maughan
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  40     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2009-05-11     Completed Date:  2009-07-07     Revised Date:  2009-07-20    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1637-44     Citation Subset:  IM; S    
Affiliation:
School of Sport & Exercise Sciences, Loughborough University, Leicestershire, United Kingdom.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Body Temperature
Cold Temperature
Drinking / physiology*
Exercise Test*
Exercise Tolerance / physiology*
Hot Temperature*
Humans
Male
Water-Electrolyte Balance
Young Adult
Comments/Corrections
Comment In:
Med Sci Sports Exerc. 2009 Aug;41(8):1681-2; author reply 1683-4   [PMID:  19617778 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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