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Aim:  The present study investigated the effects of hyperthermia on intermittent exercise and repeated sprint performance.

Methods:  Seven men completed 40 min of intermittent cycling comprising of 15 s exercise (306 ± 22 W) and 15 s rest periods (0 W) followed by 5 × 15 s maximal sprints on a cycle ergometer in normal (∼20 °C, control) and hot (40 °C, hyperthermia) environments.

Results:  Completion of the intermittent protocol in the heat elevated core and muscle temperatures (39.5 ± 0.2 °C; 40.2 ± 0.4 °C), heart rate (178 ± 11 beats min⁻¹), rating of perceived exertion (RPE) (18 ± 1) and noradrenaline (38.9 ± 13.2 μmol l⁻¹) (all P < 0.05). During the first sprint (n = 6), both peak and mean power output were similar across the environmental conditions. However, mean power over the last four sprints declined to a larger extent during hyperthermia compared with the control …