| The influence of serial feeding of drinks at different temperatures on thermoregulatory responses during cycling. | |
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MedLine Citation:
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PMID: 18344129 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In this study, we examined thermoregulatory responses to ingestion of separate aliquots of drinks at different temperatures during low-intensity exercise in conditions of moderate heat stress. Eight men cycled at 50% (s = 3) of their peak oxygen uptake (VO2peak) for 90 min (dry bulb temperature: 25.3 degrees C, s = 0.5; relative humidity: 60%, s = 5). Four 400-ml aliquots of flavoured water at 10 degrees C (cold), 37 degrees C (warm) or 50 degrees C (hot) were ingested after 30, 45, 60, and 75 min of exercise. Immediately after the 90 min of exercise, participants cycled at 95% VO2peak to exhaustion to assess exercise capacity. There were no differences between trials in rectal temperature at the end of the 90 min of exercise (cold: 38.11 degrees C, s = 0.30; warm: 38.10 degrees C, s = 0.33; hot: 38.21 degrees C, s = 0.30; P = 0.765). Mean skin temperature between 30 and 90 min tended to be influenced by drink temperature (cold: 34.49 degrees C, s = 0.64; warm: 34.53 degrees C, s = 0.69; hot: 34.71 degrees C, s = 0.48; P = 0.091). Mean heart rate from 30 to 90 min was higher in the hot trial (129 beats . min(-1), s = 7; P < 0.05) than on the cold (124 beats . min(-1), s = 9) and warm trials (126 beats . min(-1), s = 8). Ratings of thermal sensation were higher on the hot trial than on the cold trial at 35 and 50 min (P < 0.05). Exercise capacity was similar between trials (P = 0.963). The heat load and debt induced by periodic drinking resulted in similar body temperatures during low-intensity exercise in conditions of moderate heat stress due to appropriate thermoregulatory reflexes. |
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Authors:
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Jason K W Lee; Ron J Maughan; Susan M Shirreffs |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of sports sciences Volume: 26 ISSN: 0264-0414 ISO Abbreviation: J Sports Sci Publication Date: 2008 Apr |
Date Detail:
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Created Date: 2008-03-17 Completed Date: 2008-08-05 Revised Date: - |
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: 583-90 Citation Subset: IM |
Affiliation:
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School of Sport and Exercise Sciences, Loughborough University, Loughborough, UK. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bicycling / physiology* Body Temperature Regulation / physiology* Cohort Studies Drinking / physiology* Exercise Test Exercise Tolerance / physiology* Humans Male Temperature* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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