Mean rectal temperature (°C) data for each condition over the experimental period. Mean rectal temperature (°C) data for each condition over the experimental period. Conditions and significant differences as marked () = p<0.1 in this comparison (n=9). Tre EXERCISE, rectal temperature during clothed exercise for 30 minutes; Tre IMM35, rectal temperature during 35°C water immersion; Tre IMM40, rectal temperature during 40°C water immersion. Michael J Tipton et al. BMJ Open Sport Exerc Med 2017;3:e000210 ©2017 by BMJ Publishing Group Ltd