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Rectal temperature, heart rate and physiological strain index time course for the three exercise-heat stress conditions. Note HOT error bars removed for clarity (HOT mean ± SD; PSI 4.8 ± 1.3, HR 142 ± 14 bpm, T rec 37.71 ± 0.32 °C) number sign significant difference between TEMP and HOT p < 0.05. asterisk significant difference between TEMP and VHOT p < 0.05. dagger symbol significant difference between HOT and VHOT p < 0.05
