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The aim of this paper is to investigate the cardiorespiratory synchronizationin athletes subjected to extreme physical stress combined with a cognitivestress tasks. ECG and respiration were measured in 14 athletes before and afterthe Ironmen competition. Stroop test was applied between the measurementsbefore and after the Ironmen competition to induce cognitive stress.Synchrogram and empirical mode decomposition analysis were used for the firsttime to investigate the effects of physical stress, induced by the Ironmencompetition, on the phase synchronization of the cardiac and respiratorysystems of Ironmen athletes before and after the competition. A cognitivestress task (Stroop test) was performed both pre- and post-Ironman event inorder to prevent the athletes from cognitively controlling their breathingrates. Our analysis showed that cardiorespiratory synchronization increasedpost-Ironman race compared to pre-Ironman. The results suggest that the amountof stress the athletes are recovering from post-competition is greater than theeffects of the Stroop test. This indicates that the recovery phase after thecompetition is more important for restoring and maintaining homeostasis, whichcould be another reason for stronger synchronization.

Effect of stress on cardiorespiratory synchronization of Ironmen athletes