| Sweat lactate response during cycling at 30 degrees C and 18 degrees C WBGT. | |
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MedLine Citation:
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PMID: 15161105 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Sweat lactate reflects eccrine gland metabolism. However, the metabolic tendencies of eccrine glands in a hot versus thermoneutral environment are not well understood. Sixteen male volunteers completed a maximal cycling trial and two 60-min cycling trials [30 degrees C = 30 +/- 1 degrees C and 18 degrees C = 18 +/- 1 degrees C wet bulb globe temperature (WBGT)]. The participants were requested to maintain a cadence of 60 rev min(-1) with the intensity individualized at approximately 90% of the ventilatory threshold. Sweat samples at 10, 20, 30, 40, 50 and 60 min were analysed for lactate concentration. Sweat rate at 30 degrees C (1380 +/- 325 ml x h(-1)) was significantly greater (P < 0.05) than at 18 degrees C (632 +/- 311 ml x h(-1)). Sweat lactate concentration was significantly greater (P < 0.05) at each time point during the 18 degrees C trial, with values between trials tending to converge across time. During the 30 degrees C trial, both heart rate (20, 30, 40, 50 and 60 min) and rectal temperature (30, 40, 50 and 60 min) were significantly higher than in the 18 degrees C trial. Higher sweat lactate concentrations coupled with lower sweat rates may indicate a greater relative contribution of oxygen-independent metabolism within eccrine glands during exercise at 18 degrees C. Decreases in sweat lactate concentration across time suggest either greater dilution due to greater sweat volume or increased reliance on aerobic metabolism within eccrine glands. The convergence of lactate concentrations between trials may indicate that time-dependent modifications in sweat gland metabolism occur at different rates contingent partially on environmental conditions. |
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Authors:
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J M Green; R C Pritchett; D C Tucker; T R Crews; J R McLester |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of sports sciences Volume: 22 ISSN: 0264-0414 ISO Abbreviation: J Sports Sci Publication Date: 2004 Apr |
Date Detail:
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Created Date: 2004-05-26 Completed Date: 2004-08-17 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8405364 Medline TA: J Sports Sci Country: England |
Other Details:
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Languages: eng Pagination: 321-7 Citation Subset: IM |
Affiliation:
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Department of Physical Education and Recreation, Western Kentucky University, Bowling Green, KY 42101, USA. matt.green@wku.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Bicycling / physiology* Body Temperature Regulation / physiology Eccrine Glands / metabolism* Exercise Test Humans Lactates / analysis* Male Physical Exertion Physical Fitness Prospective Studies Sweat / chemistry Sweating / physiology* Temperature |
| Chemical | |
Reg. No./Substance:
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0/Lactates |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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