The influence of light and heavy training weeks on the cortisol and testosterone awakening responses of elite male judokas: is skeletal muscle damage a mediating factor?

Autor: Crewther BT; School of Science and Technology, University of New England, Armidale, Australia.; Institute of Sport - National Research Institute, Warsaw, Poland.; School of Electrical Engineering and Robotics, Queensland University of Technology, Brisbane, Australia., Serpell BG; School of Science and Technology, University of New England, Armidale, Australia.; Geelong Cats Football Club, Geelong, Victoria, Australia., Cook CJ; School of Science and Technology, University of New England, Armidale, Australia.; Geelong Cats Football Club, Geelong, Victoria, Australia., Obmiński Z; School of Science and Technology, University of New England, Armidale, Australia.; School of Science and Technology, University of New England, Armidale, Australia.
Jazyk: angličtina
Zdroj: Biology of sport [Biol Sport] 2024 Oct; Vol. 41 (4), pp. 187-195. Date of Electronic Publication: 2024 Apr 25.
DOI: 10.5114/biolsport.2024.135415
Abstrakt: In sport, the awakening responses of cortisol (CAR) and testosterone (TAR) have been used as evaluative tools. Research findings are, however, inconsistent and the mechanisms involved are unclear. This study investigated the CAR and TAR in male athletes across light and heavy training weeks, focusing on skeletal muscle damage as a mediating factor. Twenty elite male judokas were assessed across consecutive weeks of light and heavy training (i.e., 6 days, 9-10 weekly sessions). Plasma cortisol and testosterone concentrations were measured post-awakening (+3, +30, +60 mins), along with creatine kinase (CK) at +3 mins. The CAR and TAR were indexed by baseline-corrected change scores (Δb30, Δb60) and area under the curve (AUCb30, AUCb60). The early-morning surge in plasma cortisol concentration (CAR Δb30 , CAR Δb60 , CAR AUCb30 , CAR AUCb60 ) was significantly larger after light versus heavy training with effect-size differences of 2.14-2.64. The post-awakening decline in plasma testosterone (TAR Δb30 , TAR AUCb30 , TAR AUCb60 ) was found to be significantly less pronounced, whilst CK level was elevated, after heavy than light training with effect-size differences of 0.95-1.04 and 4.70, respectively. Causal mediation analysis confirmed that CK mediated, in part, the training effect on the CAR, but not TAR, measures. In summary, male judokas, upon rising after a light training block, displayed a rising CAR (36%, 22%) and declining TAR (-11%, -15%) at +30 and +60 mins. A high-intensity training block suppressed the CAR (21%, 8%) and attenuated the TAR (-7%, -13%) with accompanying muscle damage offering one mechanism to partly explain the CAR differences.
Competing Interests: The authors report that there are no competing interests to declare.
(Copyright © Institute of Sport – National Research Instutite.)
Databáze: MEDLINE
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