Document Detail


Leukocyte subset responses during exercise under heat stress with carbohydrate or water intake.
MedLine Citation:
PMID:  16110687     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: This study investigated leukocyte subset responses to moderate-intensity exercise under heat stress, with water (W) or carbohydrate (CHO) drink ingestion. METHODS: In repeated trials, 13 soldiers consumed either a W or CHO drink during 3 h of walking at 4.4 km x h(-1) with a 5% gradient (15 min rest per hour) under heat stress (35 degrees C and 55% relative humidity). The soldiers wore combat uniforms and carried water bottles and dummy rifles and ammunition, altogether weighing about 11.5 +/- 1.0 kg. RESULTS: Plasma glucose concentration was significantly higher with CHO than W ingestion during exercise (p < 0.01). There were no significant differences between W and CHO conditions in exercise performance, plasma cortisol concentration, heart rate, or core temperature. CHO ingestion significantly moderated the increases in leukocyte (83% in W, 28% in CHO; p < 0.001), monocyte (60% in W, 34% in CHO; p < 0.05), and granulocyte counts (120% in W, 30% in CHO; p < 0.001), but not in lymphocyte count (41% in W, 25% in CHO). CONCLUSIONS: The increases in leukocyte and subset counts during moderate-intensity exercise under heat stress may be comparable to those observed during intense exercise in cool conditions. The response of immune cell counts is blunted by CHO intake during moderate-intensity exercise in the heat, and may not occur through the cortisol pathway.
Authors:
Chin Leong Lim; Christopher Byrne; Serena A N Chew; Laurel T Mackinnon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  76     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-08-22     Completed Date:  2005-10-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  726-32     Citation Subset:  IM; S    
Affiliation:
Military Physiology Laboratory, Defence Medical and Environmental Research, DSO National Laboratories, 27 Medical Drive, #09-01, Singapore 117510, Republic of Singapore. limcl@dso.org.sg
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Glucose
Dietary Carbohydrates
Drinking Behavior
Exercise / physiology*
Heart Rate
Heat Stress Disorders*
Humans
Hydrocortisone / blood
Leukocytes / physiology*
Male
Water
Chemical
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Carbohydrates; 50-23-7/Hydrocortisone; 7732-18-5/Water

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


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