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[middle dot]kg-1 of either ice slurry (-1[degrees]C) or cold water (4[degrees]C) before running to exhaustion at their first ventilatory threshold in a hot environment (34.0[degrees]C +/- 0.2[degrees]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[degrees]C +/- 0.14[degrees]C after ice slurry ingestion compared with 0.25[degrees]C +/- 0.09[degrees]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[degrees]C +/- 0.41[degrees]C) versus cold water ingestion (39.05[degrees]C +/- 0.37[degrees]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[middle dot]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.
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