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Ice slurry ingestion increases core temperature capacity and running time in the heat

Citation

Siegel, R and Mate, J and Brearley, MB and Watson, G and Nosaka, K and Laursen, PB, Ice slurry ingestion increases core temperature capacity and running time in the heat, Medicine and Science in Sports and Exercise, 42, (4) pp. 717-725. ISSN 0195-9131 (2010) [Refereed Article]


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Copyright Statement

Copyright 2010 American College of Sports Medicine

DOI: doi:10.1249/MSS.0b013e3181bf257a

Abstract

PURPOSE: To investigate the effect of ice slurry ingestion on thermoregulatory responses and submaximal running time in the heat.

METHODS: On two separate occasions, in a counterbalanced order, 10 males ingested 7.5 g.kg-1 of either ice slurry (-1°C) or cold water (4°C) before running to exhaustion at their first ventilatory threshold in a hot environment (34.0°C ± 0.2°C, 54.9% ± 5.9% relative humidity). Rectal and skin temperatures, HR, sweating rate, and ratings of thermal sensation and perceived exertion were measured.

RESULTS: Running time was longer (P = 0.001) after ice slurry (50.2 ± 8.5 min) versus cold water (40.7 ± 7.2 min) ingestion. Before running, rectal temperature dropped 0.66°C ± 0.14°C after ice slurry ingestion compared with 0.25°C ± 0.09°C (P = 0.001) with cold water and remained lower for the first 30 min of exercise. At exhaustion, however, rectal temperature was higher (P = 0.001) with ice slurry (39.36°C ± 0.41°C) versus cold water ingestion (39.05°C ± 0.37°C). During exercise, mean skin temperature was similar between conditions (P = 0.992), as was HR (P = 0.122) and sweat rate (P = 0.242). After ice slurry ingestion, subjects stored more heat during exercise (100.10 ± 25.00 vs 78.93 ± 20.52 W.m-2, P = 0.005), and mean ratings of thermal sensation (P = 0.001) and perceived exertion (P = 0.022) were lower.

CONCLUSIONS: Compared with cold water, ice slurry ingestion lowered preexercise rectal temperature, increased submaximal endurance running time in the heat (+19% ± 6%), and allowed rectal temperature to become higher at exhaustion. As such, ice slurry ingestion may be an effective and practical precooling maneuver for athletes competing in hot environments.

Item Details

Item Type:Refereed Article
Keywords:precooling, rectal temperature, thermoregulation, time to exhaustion
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Exercise Physiology
Objective Division:Health
Objective Group:Health and Support Services
Objective Field:Health and Support Services not elsewhere classified
Author:Watson, G (Dr Greig Watson)
ID Code:78801
Year Published:2010
Web of Science® Times Cited:66
Deposited By:Health Sciences A
Deposited On:2012-07-27
Last Modified:2012-10-29
Downloads:28 View Download Statistics

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