Boris R M Kingma1, Nisha Charkoudian2, Matthew D White3. 1. Unit Defence, Safety and Security, Department of Human Performance Netherlands Organisation for Applied Scientific Research Soesterberg, The Netherlands. 2. Thermal and Mountain Medicine Division United States Army Research Institute of Environmental Medicine Natick, MA, USA. 3. Laboratory for Exercise and Environmental Physiology Department of Biomedical Physiology and Kinesiology Simon Fraser University Burnaby, British Columbia, Canada.