Figure 1. Experimental protocol and testing timeline related to a short duration high intensity interval training program (five 27 min sessions in 9 days) in the heat (temperature = 38.7 ± 0.5 °C, relative humidity = 34.4 ± 1.3 %) or at room temperature (22.3 ± 0.2 °C; 35.8 ± 0.6 %). ↑ denotes competition on the weekend.