Figure 1.

Schematic representation of the experimental design. Participants underwent 2 familiarization sessions on separate days before they performed a body composition assessment, incremental test to exhaustion. A blood sample was taken after the incremental test. HIIT then started for 4 consecutive weeks with 3 sessions per week. Two to 3 d after completion of the training period, body composition, incremental test to exhaustion and blood sampling were performed again. PPO = peak power output, RH = relative humidity