Thermoregulatory responses to ice-slush beverage ingestion and exercise in the heat

Stanley, Jamie, Leveritt, Michael and Peake, Jonathan M. (2010) Thermoregulatory responses to ice-slush beverage ingestion and exercise in the heat. European Journal of Applied Physiology, 110 6: 1163-1173. doi:10.1007/s00421-010-1607-3


Author Stanley, Jamie
Leveritt, Michael
Peake, Jonathan M.
Title Thermoregulatory responses to ice-slush beverage ingestion and exercise in the heat
Journal name European Journal of Applied Physiology   Check publisher's open access policy
ISSN 1439-6319
1439-6327
Publication date 2010-12
Sub-type Article (original research)
DOI 10.1007/s00421-010-1607-3
Volume 110
Issue 6
Start page 1163
End page 1173
Total pages 11
Place of publication Berlin, Germany
Publisher Springer
Collection year 2011
Language eng
Formatted abstract
We compared the effects of an ice-slush beverage (ISB) and a cool liquid beverage (CLB) on cycling performance, changes in rectal temperature (Tre) and stress responses in hot, humid conditions. Ten trained male cyclists/triathletes completed two exercise trials (75 min cycling at ~60% peak power output + 50 min seated recovery + 75% peak power output × 30 min performance trial) on separate occasions in 34°C, 60% relative humidity. During the recovery phase before the performance trial, the athletes consumed either the ISB (mean ± SD -0.8 ± 0.1°C) or the CLB (18.4 ± 0.5°C). Performance time was not significantly different after consuming the ISB compared with the CLB (29.42 ± 2.07 min for ISB vs. 29.98 ± 3.07 min for CLB, P = 0.263). Tre (37.0 ± 0.3°C for ISB vs. 37.4 ± 0.2°C for CLB, P = 0.001) and physiological strain index (0.2 ± 0.6 for ISB vs. 1.1 ± 0.9 for CLB, P = 0.009) were lower at the end of recovery and before the performance trial after ingestion of the ISB compared with the CLB. Mean thermal sensation was lower (P < 0.001) during recovery with the ISB compared with the CLB. Changes in plasma volume and the concentrations of blood variables (i.e., glucose, lactate, electrolytes, cortisol and catecholamines) were similar between the two trials. In conclusion, ingestion of ISB did not significantly alter exercise performance even though it significantly reduced pre-exercise Tre compared with CLB. Irrespective of exercise performance outcomes, ingestion of ISB during recovery from exercise in hot humid environments is a practical and effective method for cooling athletes following exercise in hot environments.
© 2010 Springer-Verlag.
Keyword Drink temperature
Phase change
Heat strain
Recovery-cooling
Endurance performance
Cycling performance
Prolonged exercise
Drink temperature
Body temperature
Thermal comfort
Fluid intake
Capacity
Water
Environment
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Human Movement and Nutrition Sciences Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 21 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 19 Dec 2010, 00:13:54 EST