A significant number of military personnel suffer from exertional heat illness, with some extreme cases resulting in death. These illnesses may occur without warning, they are often characterised by a rapid onset and can occur even in experienced personnel. Various field treatments for hyperthermia have been developed, and one of particular interest is the use of cold-water immersion. Not surprisingly, immersion in ice-cold water (0-2oC) has been shown to be an effective means of rapidly reducing body core temperature (Proulx et al., 2003, 2006).
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Caldwell, J. N., van den Heuvel, A. M. J., Kerry, P., Clark, M. J., Peoples, G. E. & Taylor, N. A. S. Immersion cooling during hyperthermia: why warmer may be better. Proceedings of the 13th International Conference on Environmental Ergonomics, ICEE; Boston, USA: University of Wollongong; 2009. 238-241.