1. Extreme Environments Laboratory, Department of Sport and Exercise Sciences, University of Portsmouth, Spinnaker Building, Cambridge Road, Portsmouth, Hants PO1 2ER, UK.
2. CFWMS Human Performance Research and Development Canadian Armed Forces, 4210 Labelle St., Ottawa, ON K1A 0K2, Canada.
3. Department of Educational and Counselling Psychology, and Special Education, University of British Columbia, Scarfe Building, 2125 Main Mall, Vancouver, BC V6T 1Z4, Canada.