SIEGEL R, MATÉ J, BREARLEY MB, WATSON G, NOSAKA K, LAURSEN PB. ICE SLURRY INGESTION INCREASES CORE TEMPERATURE CAPACITY AND RUNNING TIME IN THE HEAT. MED SCI SPORTS EXERC. 2010 APR;42(4):717-25.
This study was the first to show the beneficial effect of ice slushy ingestion on prolonged running in the heat. Subjects ingested around half a litre of either cold water (4°C) or ice slushy (-1°C) in the 30-minute period prior to steady state running in the heat and ran nearly 20% longer when they ingested ice slushy.