Document Detail

The Effect of Time-of-Day on Cold Water Ingestion by High-Level Swimmers in Tropical Climate.
MedLine Citation:
PMID:  23295257     Owner:  NLM     Status:  Publisher    
We tested the effect of cold water ingestion during high-intensity training in the morning versus the evening on both the core temperature and thermal perceptions of internationally ranked long-distance swimmers during a training period in a tropical climate. Nine internationally ranked long-distance swimmers (5 males and 4 females) performed 4 randomized training sessions (2 in the evening and 2 in the morning) with 2 randomized beverages with different temperatures for 3 consecutive days. After a standardized warm-up of 1000-m, the subjects performed a standardized training session that consisted of 10 x 100-m (start every 1'20") at a fixed velocity. The swimmers were then followed for the next 3000-m of the training schedule. Heart rate (HR) was continuously monitored during the 10 x 100-m, whereas core temperature (TC), thermal comfort (TC) and thermal sensation (TS) were measured before and after each 1000-m session. Before and after each 1000-m, the swimmers were asked to drink 190 mL of neutral (26.5 ±2.5°C) or cold (1.3 ±0.3°C) water packaged in standardized bottles. Results demonstrated that cold water ingestion induced a significant effect on TC with a pronounced decrease in the evening, resulting in significantly lower mean TC and lower mean delta TC in evening-cold (EC) than in evening-neutral (EN), concomitant with significantly lower TS in EC than in EN and a significant effect on exercise HR. Moreover, although TC increased significantly along time in MN, MC and EN, TC was stabilized during exercise in EC. To conclude, we demonstrate that a cold beverage had a significant effect on TC, TS and HR during training in high-level swimmers in a tropical climate, especially during evening training.
Olivier Hue; Roland Monjo; Marc Lazzaro; Michelle Baillot; Philippe Hellard; Laurent Marlin; A Jean-Etienne
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-4
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  -     ISSN:  1555-0265     ISO Abbreviation:  Int J Sports Physiol Perform     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Laboratoire ACTES, UPRES-EA 3596, UFR-STAPS, Université des Antilles et de la Guyane, Campus de Fouillole, Guadeloupe, France.
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