Table 1. Cardiorespiratory variables and body temperatures during each sprint and average of all sprints. Sprint number ANOVA (ηp2) 1 2 3 Average Interaction Condition Time Peak HR (bpm) CON 155 ± 4 162 ± 5 * 166 ± 4 * 161 ± 4 HYP 155 ± 4 161 ± 4 * 164 ± 4 * 160 ± 4 0.648 < 0.001 < 0.001 HH 166 ± 5 † ‡ 172 ± 4 *† ‡ 174 ± 4 *† ‡ 171 ± 4 † ‡ (0.082) (0.852) (0.938) Lowest SpO2 (%) CON 90.7 ± 1.4 89.1 ± 2.2 92.0 ± 1.1 90.6 ± 1.4 HYP 81.6 ± 1.1 †  83.3 ± 1.1 †  83.7 ± 0.7 †  82.9 ± 0.8 †  0.094 < 0.001 0.703 HH 83.9 ± 1.4 †  83.8 ± 1.2 †  82.0 ± 1.7 †  83.2 ± 1.2 †  (0.240) (0.735) (0.049) VO2 (mL/min) CON 940 ± 84 1253 ± 45 * 1253 ± 50 * 1149 ± 40 HYP 831 ± 71 1042 ± 81 *†  1067 ± 50 * 980 ± 52 †  0,888 0,018 0,012 HH 815 ± 105 1034 ± 34 †  1045 ± 72 965 ± 42 †  (0.039) (0.435) (0.612) Muscle temperature (°C) CON 36.1 ± 0.7 36.5 ± 0.6 * 36.8 ± 0.5 * 36.5 ± 0.2 HYP 36.0 ± 0.6 36.5 ± 0.5 * 36.8 ± 0.4 * 36.4 ± 0.2 0.089 < 0.001 < 0.001 HH 37.1 ± 0.3 † ‡ 37.3 ± 0.3 *† ‡ 37.5 ± 0.3 *† ‡ 37.3 ± 0.1 † ‡ (0.266) (0.663) (0.927) Skin temperature (°C) CON 31.9 ± 0.2 32.2 ± 0.2 * 32.4 ± 0.2 * 32.1 ± 0.2 HYP 31.7 ± 0.2 32.0 ± 0.2 * 32.3 ± 0.2 * 32.0 ± 0.2 < 0.001 < 0.001 0.001 HH 35.6 ± 0.1 † ‡ 35.1 ± 0.1 *† ‡ 35.0 ± 0.1 *† ‡ 35.2 ± 0.1 † ‡ (0.739) (0.963) (0.573) ‡: P < 0.05 vs. HYP *: P < 0.05 vs. the first sprint, † : P < 0.05 vs. CON, Values are means ± standard error of the mean.