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Interactions between perceived exertion and thermal perception in the heat in endurance athletes

Abstract : Introduction : The study aimed to investigate how a distortion of perceived exertion in the heat may affect, during a self-paced cycling exercise preceded by prior cognitive task, the thermal perception and the subsequent regulation of power output in high level athletes. Methods : Eleven endurance trained male athletes completed four experimental sessions including a 30-min fixed-RPE (15-Hard) cycling exercise in neutral (TMP-22 °C) and hot (HOT-37 °C) conditions, following a 60-min incongruent Stroop task (EXP) or passively watching documentary films (CON). Central and peripheral performances of the knee extensors were assessed before the cognitive task and after the exercise. Results : Although mental demand and effort were higher in EXP (P < 0.05), no effect of prior cognitive task was observed on subjective feelings of mental fatigue or decline in power output at a fixed RPE. Average exercise intensity was lower in HOT than TMP (3.14 ± 0.09 W⋅kg−1vs. 3.42 ± 0.10 W⋅kg−1 respectively, P < 0.05). Skin temperature and warmth sensations were higher in HOT throughout the exercise (P < 0.05) but not thermal comfort. Central and peripheral parameters were not affected more in HOT than in TMP. Conclusion : Although the effects of combined stressors on the distortion of perceived exertion could not be verified, the greater decline in power output recorded in HOT than TMP suggest a high contribution of both perceptual and cardiovascular responses in the regulation of work rate when the subject is in mild hyperthermia.
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Submitted on : Thursday, September 13, 2018 - 4:41:04 PM
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Gilles Roussey, Mathieu Gruet, Fabrice Vercruyssen, Julien Louis, Jean-Marc Vallier, et al.. Interactions between perceived exertion and thermal perception in the heat in endurance athletes. Journal of Thermal Biology, Elsevier, 2018, 76, pp.68 - 76. ⟨10.1016/j.jtherbio.2018.07.006⟩. ⟨hal-01873921⟩



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