Thermoregulatory responses to ice-slush beverage ingestion and exercise in the heat |
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Authors: | Jamie Stanley Michael Leveritt Jonathan M Peake |
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Institution: | (1) Centre of Excellence for Applied Sport Science Research, Queensland Academy of Sport, Brisbane, Australia;(2) The University of Queensland, School of Human Movement Studies, Brisbane, QLD, 4072, Australia;(3) School of Public Health, Griffith University, Gold Coast, Australia |
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Abstract: | We compared the effects of an ice-slush beverage (ISB) and a cool liquid beverage (CLB) on cycling performance, changes in
rectal temperature (T
re) 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). T
re (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 T
re 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. |
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